diff --git a/aio.html b/aio.html
index f3dbb88a..7e204540 100644
--- a/aio.html
+++ b/aio.html
@@ -2384,7 +2384,7 @@ <h4 class="accordion-header" id="headingSolution1">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
 <div class="accordion-body">
 <p>R1) No: filenames should be in lowercase.</p>
 <p>R2) No: filename too long. This filename will be shortened afterwards
@@ -2681,7 +2681,7 @@ <h4 class="accordion-header" id="headingSolution1">
   A. ‘Title of the paper’, ‘Authors’, ‘Reference’
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
 <div class="accordion-body">
 <ul>
 <li>
@@ -2704,7 +2704,7 @@ <h4 class="accordion-header" id="headingSolution2">
   B. ‘Abstract’ and ‘Description’
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
 <div class="accordion-body">
 <ul>
 <li>
@@ -2735,7 +2735,7 @@ <h4 class="accordion-header" id="headingSolution3">
   C. ‘Byte-by-byte Description of file’
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
 <div class="accordion-body">
 <p>This section describes the structure of each data files (files with
 the .dat extension). This description is made in a tabular form, each
@@ -3562,7 +3562,7 @@ <h3 class="card-title">Objectives</h3>
 materials and tutorials on how to use its features. The Portal also
 offers information for potential service providers on how to onboard
 their services to the EOSC Portal Catalogue &amp; Marketplace.</p>
-<figure><img src="https://raw.githubusercontent.com/cds-astro/a-FAIR-journey-for-astronomical-data/main/episodes/images/eosc_portal_june23/eosc_portal__main_page.png" alt="Screenshot: EOSC Portal homepage, from September 2023" class="figure mx-auto d-block"><figcaption>Figure: EOSC Portal homepage (screenshot from
+<figure><img src="https://raw.githubusercontent.com/cds-astro/a-FAIR-journey-for-astronomical-data/main/episodes/images/eosc_portal_sept23/eosc_portal__main_page.png" alt="Screenshot: EOSC Portal homepage, from September 2023" class="figure mx-auto d-block"><figcaption>Figure: EOSC Portal homepage (screenshot from
 September 2023)</figcaption></figure><!--  ----------------------------------------- --><!--            Case study 	                --><!--  ----------------------------------------- --></section><section id="case-study-gaia-dr3"><h2 class="section-heading">Case Study: Gaia DR3<a class="anchor" aria-label="anchor" href="#case-study-gaia-dr3"></a>
 </h2>
 <hr class="half-width">
@@ -3575,11 +3575,11 @@ <h3 id="step-1-search">Step 1: Search<a class="anchor" aria-label="anchor" href=
 <p>The first step is to type the name of your catalogue, dataset, paper,
 DOI in the Search bar on <a href="https://eosc-portal.eu/" class="external-link">EOSC
 portal</a>, as illustrated in the figure below.</p>
-<figure><img src="https://raw.githubusercontent.com/cds-astro/a-FAIR-journey-for-astronomical-data/main/episodes/images/eosc_portal_june23/case_study__gaia_dr3__step1_search.png" alt="Screenshot: EOSC Portal search for 'Gaia DR3' using homepage, from September 2023" class="figure mx-auto d-block"><figcaption>Figure: Searching for ‘Gaia DR3’ on EOSC Portal –
+<figure><img src="https://raw.githubusercontent.com/cds-astro/a-FAIR-journey-for-astronomical-data/main/episodes/images/eosc_portal_sept23/case_study__gaia_dr3__step1_search.png" alt="Screenshot: EOSC Portal search for 'Gaia DR3' using homepage, from September 2023" class="figure mx-auto d-block"><figcaption>Figure: Searching for ‘Gaia DR3’ on EOSC Portal –
 search from homepage (screenshot from September 2023)</figcaption></figure><p>You can also <a href="https://marketplace.eosc-portal.eu/" class="external-link">browse
 directly the Marketplace</a>, from the same website. You will get the
 same results in the end.</p>
-<figure><img src="https://raw.githubusercontent.com/cds-astro/a-FAIR-journey-for-astronomical-data/main/episodes/images/eosc_portal_june23/case_study__gaia_dr3__step1_search_browse_marketplace.png" alt="Screenshot: EOSC Portal search for 'Gaia DR3' using 'Browse Marketplace' page, from September 2023" class="figure mx-auto d-block"><figcaption>Figure: Searching for ‘Gaia DR3’ on EOSC Portal –
+<figure><img src="https://raw.githubusercontent.com/cds-astro/a-FAIR-journey-for-astronomical-data/main/episodes/images/eosc_portal_sept23/case_study__gaia_dr3__step1_search_browse_marketplace.png" alt="Screenshot: EOSC Portal search for 'Gaia DR3' using 'Browse Marketplace' page, from September 2023" class="figure mx-auto d-block"><figcaption>Figure: Searching for ‘Gaia DR3’ on EOSC Portal –
 Browse Marketplace tab (screenshot from September 2023)</figcaption></figure><hr>
 <hr>
 </div>
@@ -3592,7 +3592,7 @@ <h3 id="step-2-scan-list-of-records">Step 2: Scan list of records<a class="ancho
 data at the top (eg. Catalogs, Publications, Data, Software …).</p>
 <p>In our example (Gaia DR3), we can see that the search is done on
 multiple fields: Title, Author names, abstract.</p>
-<figure><img src="https://raw.githubusercontent.com/cds-astro/a-FAIR-journey-for-astronomical-data/main/episodes/images/eosc_portal_june23/case_study__gaia_dr3__step2_all_records.png" alt="Screenshot: EOSC Portal search for 'Gaia DR3' -- scanning through all the records, from September 2023" class="figure mx-auto d-block"><figcaption>Figure: Searching for ‘Gaia DR3’ on EOSC Portal – all
+<figure><img src="https://raw.githubusercontent.com/cds-astro/a-FAIR-journey-for-astronomical-data/main/episodes/images/eosc_portal_sept23/case_study__gaia_dr3__step2_all_records.png" alt="Screenshot: EOSC Portal search for 'Gaia DR3' -- scanning through all the records, from September 2023" class="figure mx-auto d-block"><figcaption>Figure: Searching for ‘Gaia DR3’ on EOSC Portal – all
 records (screenshot from September 2023)</figcaption></figure><hr>
 <!-- --------------------- -->
 </div>
@@ -3604,7 +3604,7 @@ <h3 id="advanced-search">Advanced search<a class="anchor" aria-label="anchor" hr
 the ‘Show Advanced Search’ button below the main Search bar.</p>
 <p>The search can be narrowed by ‘author’, ‘exact phrase’, ‘in title’,
 ‘none of’, as illustrated in the Figure below.</p>
-<figure><img src="https://raw.githubusercontent.com/cds-astro/a-FAIR-journey-for-astronomical-data/main/episodes/images/eosc_portal_june23/case_study__gaia_dr3__step2_all_records_advanced_filtering.png" alt="Screenshot: EOSC Portal search for 'Gaia DR3' -- scanning through all the records and filtering using the 'advanced search' option, from September 2023" class="figure mx-auto d-block"><figcaption>Figure: Searching for ‘Gaia DR3’ on EOSC Portal – all
+<figure><img src="https://raw.githubusercontent.com/cds-astro/a-FAIR-journey-for-astronomical-data/main/episodes/images/eosc_portal_sept23/case_study__gaia_dr3__step2_all_records_advanced_filtering.png" alt="Screenshot: EOSC Portal search for 'Gaia DR3' -- scanning through all the records and filtering using the 'advanced search' option, from September 2023" class="figure mx-auto d-block"><figcaption>Figure: Searching for ‘Gaia DR3’ on EOSC Portal – all
 records, with extra filtering (screenshot from September 2023)</figcaption></figure><hr>
 <hr>
 </div>
@@ -3621,7 +3621,7 @@ <h3 id="step-3-select-an-entry">Step 3: Select an entry<a class="anchor" aria-la
 select one of the two data sources available: <a href="https://doi.org/http://doi.org/10.26093/cds/vizier.1355" class="external-link">B2FIND</a>
 or <a href="https://doi.org/10.26093/cds/vizier.1355" class="external-link">Strasbourg
 Astronomical Data Center</a>.</p>
-<figure><img src="https://raw.githubusercontent.com/cds-astro/a-FAIR-journey-for-astronomical-data/main/episodes/images/eosc_portal_june23/case_study__gaia_dr3__step3_result.png" alt="Screenshot: EOSC Portal search for 'Gaia DR3', from September 2023" class="figure mx-auto d-block"><figcaption>Figure: Searching for ‘Gaia DR3’ on EOSC Portal –
+<figure><img src="https://raw.githubusercontent.com/cds-astro/a-FAIR-journey-for-astronomical-data/main/episodes/images/eosc_portal_sept23/case_study__gaia_dr3__step3_result.png" alt="Screenshot: EOSC Portal search for 'Gaia DR3', from September 2023" class="figure mx-auto d-block"><figcaption>Figure: Searching for ‘Gaia DR3’ on EOSC Portal –
 result (screenshot from September 2023)</figcaption></figure><!--  ----------------------------------------- --><!--            Example				--><!--  ----------------------------------------- -->
 </div>
 </section><section id="examples-try-it-yourself"><h2 class="section-heading">Examples: try it yourself<a class="anchor" aria-label="anchor" href="#examples-try-it-yourself"></a>
@@ -3654,7 +3654,7 @@ <h4 class="accordion-header" id="headingHint1">
   Give me a hint
   </h4>
 </button>
-<div id="collapseHint1" class="accordion-collapse collapse" data-bs-parent="#accordionHint1" aria-labelledby="headingHint1">
+<div id="collapseHint1" class="accordion-collapse collapse" aria-labelledby="headingHint1" data-bs-parent="#accordionHint1">
 <div class="accordion-body">
 <p>Browse through <a href="https://eosc-portal.eu/" class="external-link">EOSC Portal</a> to
 answer the previous questions.</p>
@@ -3669,7 +3669,7 @@ <h4 class="accordion-header" id="headingSolution1">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
 <div class="accordion-body">
 <p>R1) This paper was published on <a href="https://explore.eosc-portal.eu/search/dataset?pid=10.26093%2Fcds%2Fvizier.17970082&amp;return_path=search%2Fall&amp;search_params=q%3DNGTS%2520clusters%2520survey" class="external-link">01
 Jan 2017</a>.</p>
diff --git a/images.html b/images.html
index 61c990e0..cc685d76 100644
--- a/images.html
+++ b/images.html
@@ -462,27 +462,27 @@ <h3 id="section_eosc-figure-1">Figure 1</h3>
 step 5 “integration into the IVOA, EUDAT and finally EOSC”</figcaption></figure><hr>
 <h3 id="section_eosc-figure-2">Figure 2</h3>
 <p aria-hidden="true">Image 1 of 1: ‘Screenshot: EOSC Portal homepage, from September 2023’</p>
-<figure><img src="https://raw.githubusercontent.com/cds-astro/a-FAIR-journey-for-astronomical-data/main/episodes/images/eosc_portal_june23/eosc_portal__main_page.png" alt="Screenshot: EOSC Portal homepage, from September 2023" class="figure mx-auto d-block"><figcaption>Figure: EOSC Portal homepage (screenshot from
+<figure><img src="https://raw.githubusercontent.com/cds-astro/a-FAIR-journey-for-astronomical-data/main/episodes/images/eosc_portal_sept23/eosc_portal__main_page.png" alt="Screenshot: EOSC Portal homepage, from September 2023" class="figure mx-auto d-block"><figcaption>Figure: EOSC Portal homepage (screenshot from
 September 2023)</figcaption></figure><hr>
 <h3 id="section_eosc-figure-3">Figure 3</h3>
 <p aria-hidden="true">Image 1 of 1: ‘Screenshot: EOSC Portal search for 'Gaia DR3' using homepage, from September 2023’</p>
-<figure><img src="https://raw.githubusercontent.com/cds-astro/a-FAIR-journey-for-astronomical-data/main/episodes/images/eosc_portal_june23/case_study__gaia_dr3__step1_search.png" alt="Screenshot: EOSC Portal search for 'Gaia DR3' using homepage, from September 2023" class="figure mx-auto d-block"><figcaption>Figure: Searching for ‘Gaia DR3’ on EOSC Portal –
+<figure><img src="https://raw.githubusercontent.com/cds-astro/a-FAIR-journey-for-astronomical-data/main/episodes/images/eosc_portal_sept23/case_study__gaia_dr3__step1_search.png" alt="Screenshot: EOSC Portal search for 'Gaia DR3' using homepage, from September 2023" class="figure mx-auto d-block"><figcaption>Figure: Searching for ‘Gaia DR3’ on EOSC Portal –
 search from homepage (screenshot from September 2023)</figcaption></figure><hr>
 <h3 id="section_eosc-figure-4">Figure 4</h3>
 <p aria-hidden="true">Image 1 of 1: ‘Screenshot: EOSC Portal search for 'Gaia DR3' using 'Browse Marketplace' page, from September 2023’</p>
-<figure><img src="https://raw.githubusercontent.com/cds-astro/a-FAIR-journey-for-astronomical-data/main/episodes/images/eosc_portal_june23/case_study__gaia_dr3__step1_search_browse_marketplace.png" alt="Screenshot: EOSC Portal search for 'Gaia DR3' using 'Browse Marketplace' page, from September 2023" class="figure mx-auto d-block"><figcaption>Figure: Searching for ‘Gaia DR3’ on EOSC Portal –
+<figure><img src="https://raw.githubusercontent.com/cds-astro/a-FAIR-journey-for-astronomical-data/main/episodes/images/eosc_portal_sept23/case_study__gaia_dr3__step1_search_browse_marketplace.png" alt="Screenshot: EOSC Portal search for 'Gaia DR3' using 'Browse Marketplace' page, from September 2023" class="figure mx-auto d-block"><figcaption>Figure: Searching for ‘Gaia DR3’ on EOSC Portal –
 Browse Marketplace tab (screenshot from September 2023)</figcaption></figure><hr>
 <h3 id="section_eosc-figure-5">Figure 5</h3>
 <p aria-hidden="true">Image 1 of 1: ‘Screenshot: EOSC Portal search for 'Gaia DR3' -- scanning through all the records, from September 2023’</p>
-<figure><img src="https://raw.githubusercontent.com/cds-astro/a-FAIR-journey-for-astronomical-data/main/episodes/images/eosc_portal_june23/case_study__gaia_dr3__step2_all_records.png" alt="Screenshot: EOSC Portal search for 'Gaia DR3' -- scanning through all the records, from September 2023" class="figure mx-auto d-block"><figcaption>Figure: Searching for ‘Gaia DR3’ on EOSC Portal – all
+<figure><img src="https://raw.githubusercontent.com/cds-astro/a-FAIR-journey-for-astronomical-data/main/episodes/images/eosc_portal_sept23/case_study__gaia_dr3__step2_all_records.png" alt="Screenshot: EOSC Portal search for 'Gaia DR3' -- scanning through all the records, from September 2023" class="figure mx-auto d-block"><figcaption>Figure: Searching for ‘Gaia DR3’ on EOSC Portal – all
 records (screenshot from September 2023)</figcaption></figure><hr>
 <h3 id="section_eosc-figure-6">Figure 6</h3>
 <p aria-hidden="true">Image 1 of 1: ‘Screenshot: EOSC Portal search for 'Gaia DR3' -- scanning through all the records and filtering using the 'advanced search' option, from September 2023’</p>
-<figure><img src="https://raw.githubusercontent.com/cds-astro/a-FAIR-journey-for-astronomical-data/main/episodes/images/eosc_portal_june23/case_study__gaia_dr3__step2_all_records_advanced_filtering.png" alt="Screenshot: EOSC Portal search for 'Gaia DR3' -- scanning through all the records and filtering using the 'advanced search' option, from September 2023" class="figure mx-auto d-block"><figcaption>Figure: Searching for ‘Gaia DR3’ on EOSC Portal – all
+<figure><img src="https://raw.githubusercontent.com/cds-astro/a-FAIR-journey-for-astronomical-data/main/episodes/images/eosc_portal_sept23/case_study__gaia_dr3__step2_all_records_advanced_filtering.png" alt="Screenshot: EOSC Portal search for 'Gaia DR3' -- scanning through all the records and filtering using the 'advanced search' option, from September 2023" class="figure mx-auto d-block"><figcaption>Figure: Searching for ‘Gaia DR3’ on EOSC Portal – all
 records, with extra filtering (screenshot from September 2023)</figcaption></figure><hr>
 <h3 id="section_eosc-figure-7">Figure 7</h3>
 <p aria-hidden="true">Image 1 of 1: ‘Screenshot: EOSC Portal search for 'Gaia DR3', from September 2023’</p>
-<figure><img src="https://raw.githubusercontent.com/cds-astro/a-FAIR-journey-for-astronomical-data/main/episodes/images/eosc_portal_june23/case_study__gaia_dr3__step3_result.png" alt="Screenshot: EOSC Portal search for 'Gaia DR3', from September 2023" class="figure mx-auto d-block"><figcaption>Figure: Searching for ‘Gaia DR3’ on EOSC Portal –
+<figure><img src="https://raw.githubusercontent.com/cds-astro/a-FAIR-journey-for-astronomical-data/main/episodes/images/eosc_portal_sept23/case_study__gaia_dr3__step3_result.png" alt="Screenshot: EOSC Portal search for 'Gaia DR3', from September 2023" class="figure mx-auto d-block"><figcaption>Figure: Searching for ‘Gaia DR3’ on EOSC Portal –
 result (screenshot from September 2023)</figcaption></figure><hr></section>
 </div>
     </main>
diff --git a/instructor/aio.html b/instructor/aio.html
index fbca9431..415fdddd 100644
--- a/instructor/aio.html
+++ b/instructor/aio.html
@@ -2416,7 +2416,7 @@ <h3 class="accordion-header" id="headingInstructor1">
   Instructor Note
   </h3>
 </button>
-<div id="collapseInstructor1" class="accordion-collapse collapse" aria-labelledby="headingInstructor1" data-bs-parent="#accordionInstructor1">
+<div id="collapseInstructor1" class="accordion-collapse collapse" data-bs-parent="#accordionInstructor1" aria-labelledby="headingInstructor1">
 <div class="accordion-body">
 <p>Show some good and bad examples of filenames.</p>
 </div>
@@ -2448,7 +2448,7 @@ <h4 class="accordion-header" id="headingSolution1">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
 <div class="accordion-body">
 <p>R1) No: filenames should be in lowercase.</p>
 <p>R2) No: filename too long. This filename will be shortened afterwards
@@ -2746,7 +2746,7 @@ <h4 class="accordion-header" id="headingSolution1">
   A. ‘Title of the paper’, ‘Authors’, ‘Reference’
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
 <div class="accordion-body">
 <ul>
 <li>
@@ -2769,7 +2769,7 @@ <h4 class="accordion-header" id="headingSolution2">
   B. ‘Abstract’ and ‘Description’
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
 <div class="accordion-body">
 <ul>
 <li>
@@ -2800,7 +2800,7 @@ <h4 class="accordion-header" id="headingSolution3">
   C. ‘Byte-by-byte Description of file’
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
 <div class="accordion-body">
 <p>This section describes the structure of each data files (files with
 the .dat extension). This description is made in a tabular form, each
@@ -3629,7 +3629,7 @@ <h3 class="card-title">Objectives</h3>
 materials and tutorials on how to use its features. The Portal also
 offers information for potential service providers on how to onboard
 their services to the EOSC Portal Catalogue &amp; Marketplace.</p>
-<figure><img src="https://raw.githubusercontent.com/cds-astro/a-FAIR-journey-for-astronomical-data/main/episodes/images/eosc_portal_june23/eosc_portal__main_page.png" alt="Screenshot: EOSC Portal homepage, from September 2023" class="figure mx-auto d-block"><figcaption>Figure: EOSC Portal homepage (screenshot from
+<figure><img src="https://raw.githubusercontent.com/cds-astro/a-FAIR-journey-for-astronomical-data/main/episodes/images/eosc_portal_sept23/eosc_portal__main_page.png" alt="Screenshot: EOSC Portal homepage, from September 2023" class="figure mx-auto d-block"><figcaption>Figure: EOSC Portal homepage (screenshot from
 September 2023)</figcaption></figure><!--  ----------------------------------------- --><!--            Case study 	                --><!--  ----------------------------------------- --></section><section id="case-study-gaia-dr3"><h2 class="section-heading">Case Study: Gaia DR3<a class="anchor" aria-label="anchor" href="#case-study-gaia-dr3"></a>
 </h2>
 <hr class="half-width">
@@ -3642,11 +3642,11 @@ <h3 id="step-1-search">Step 1: Search<a class="anchor" aria-label="anchor" href=
 <p>The first step is to type the name of your catalogue, dataset, paper,
 DOI in the Search bar on <a href="https://eosc-portal.eu/" class="external-link">EOSC
 portal</a>, as illustrated in the figure below.</p>
-<figure><img src="https://raw.githubusercontent.com/cds-astro/a-FAIR-journey-for-astronomical-data/main/episodes/images/eosc_portal_june23/case_study__gaia_dr3__step1_search.png" alt="Screenshot: EOSC Portal search for 'Gaia DR3' using homepage, from September 2023" class="figure mx-auto d-block"><figcaption>Figure: Searching for ‘Gaia DR3’ on EOSC Portal –
+<figure><img src="https://raw.githubusercontent.com/cds-astro/a-FAIR-journey-for-astronomical-data/main/episodes/images/eosc_portal_sept23/case_study__gaia_dr3__step1_search.png" alt="Screenshot: EOSC Portal search for 'Gaia DR3' using homepage, from September 2023" class="figure mx-auto d-block"><figcaption>Figure: Searching for ‘Gaia DR3’ on EOSC Portal –
 search from homepage (screenshot from September 2023)</figcaption></figure><p>You can also <a href="https://marketplace.eosc-portal.eu/" class="external-link">browse
 directly the Marketplace</a>, from the same website. You will get the
 same results in the end.</p>
-<figure><img src="https://raw.githubusercontent.com/cds-astro/a-FAIR-journey-for-astronomical-data/main/episodes/images/eosc_portal_june23/case_study__gaia_dr3__step1_search_browse_marketplace.png" alt="Screenshot: EOSC Portal search for 'Gaia DR3' using 'Browse Marketplace' page, from September 2023" class="figure mx-auto d-block"><figcaption>Figure: Searching for ‘Gaia DR3’ on EOSC Portal –
+<figure><img src="https://raw.githubusercontent.com/cds-astro/a-FAIR-journey-for-astronomical-data/main/episodes/images/eosc_portal_sept23/case_study__gaia_dr3__step1_search_browse_marketplace.png" alt="Screenshot: EOSC Portal search for 'Gaia DR3' using 'Browse Marketplace' page, from September 2023" class="figure mx-auto d-block"><figcaption>Figure: Searching for ‘Gaia DR3’ on EOSC Portal –
 Browse Marketplace tab (screenshot from September 2023)</figcaption></figure><hr>
 <hr>
 </div>
@@ -3659,7 +3659,7 @@ <h3 id="step-2-scan-list-of-records">Step 2: Scan list of records<a class="ancho
 data at the top (eg. Catalogs, Publications, Data, Software …).</p>
 <p>In our example (Gaia DR3), we can see that the search is done on
 multiple fields: Title, Author names, abstract.</p>
-<figure><img src="https://raw.githubusercontent.com/cds-astro/a-FAIR-journey-for-astronomical-data/main/episodes/images/eosc_portal_june23/case_study__gaia_dr3__step2_all_records.png" alt="Screenshot: EOSC Portal search for 'Gaia DR3' -- scanning through all the records, from September 2023" class="figure mx-auto d-block"><figcaption>Figure: Searching for ‘Gaia DR3’ on EOSC Portal – all
+<figure><img src="https://raw.githubusercontent.com/cds-astro/a-FAIR-journey-for-astronomical-data/main/episodes/images/eosc_portal_sept23/case_study__gaia_dr3__step2_all_records.png" alt="Screenshot: EOSC Portal search for 'Gaia DR3' -- scanning through all the records, from September 2023" class="figure mx-auto d-block"><figcaption>Figure: Searching for ‘Gaia DR3’ on EOSC Portal – all
 records (screenshot from September 2023)</figcaption></figure><hr>
 <!-- --------------------- -->
 </div>
@@ -3671,7 +3671,7 @@ <h3 id="advanced-search">Advanced search<a class="anchor" aria-label="anchor" hr
 the ‘Show Advanced Search’ button below the main Search bar.</p>
 <p>The search can be narrowed by ‘author’, ‘exact phrase’, ‘in title’,
 ‘none of’, as illustrated in the Figure below.</p>
-<figure><img src="https://raw.githubusercontent.com/cds-astro/a-FAIR-journey-for-astronomical-data/main/episodes/images/eosc_portal_june23/case_study__gaia_dr3__step2_all_records_advanced_filtering.png" alt="Screenshot: EOSC Portal search for 'Gaia DR3' -- scanning through all the records and filtering using the 'advanced search' option, from September 2023" class="figure mx-auto d-block"><figcaption>Figure: Searching for ‘Gaia DR3’ on EOSC Portal – all
+<figure><img src="https://raw.githubusercontent.com/cds-astro/a-FAIR-journey-for-astronomical-data/main/episodes/images/eosc_portal_sept23/case_study__gaia_dr3__step2_all_records_advanced_filtering.png" alt="Screenshot: EOSC Portal search for 'Gaia DR3' -- scanning through all the records and filtering using the 'advanced search' option, from September 2023" class="figure mx-auto d-block"><figcaption>Figure: Searching for ‘Gaia DR3’ on EOSC Portal – all
 records, with extra filtering (screenshot from September 2023)</figcaption></figure><hr>
 <hr>
 </div>
@@ -3688,7 +3688,7 @@ <h3 id="step-3-select-an-entry">Step 3: Select an entry<a class="anchor" aria-la
 select one of the two data sources available: <a href="https://doi.org/http://doi.org/10.26093/cds/vizier.1355" class="external-link">B2FIND</a>
 or <a href="https://doi.org/10.26093/cds/vizier.1355" class="external-link">Strasbourg
 Astronomical Data Center</a>.</p>
-<figure><img src="https://raw.githubusercontent.com/cds-astro/a-FAIR-journey-for-astronomical-data/main/episodes/images/eosc_portal_june23/case_study__gaia_dr3__step3_result.png" alt="Screenshot: EOSC Portal search for 'Gaia DR3', from September 2023" class="figure mx-auto d-block"><figcaption>Figure: Searching for ‘Gaia DR3’ on EOSC Portal –
+<figure><img src="https://raw.githubusercontent.com/cds-astro/a-FAIR-journey-for-astronomical-data/main/episodes/images/eosc_portal_sept23/case_study__gaia_dr3__step3_result.png" alt="Screenshot: EOSC Portal search for 'Gaia DR3', from September 2023" class="figure mx-auto d-block"><figcaption>Figure: Searching for ‘Gaia DR3’ on EOSC Portal –
 result (screenshot from September 2023)</figcaption></figure><!--  ----------------------------------------- --><!--            Example				--><!--  ----------------------------------------- -->
 </div>
 </section><section id="examples-try-it-yourself"><h2 class="section-heading">Examples: try it yourself<a class="anchor" aria-label="anchor" href="#examples-try-it-yourself"></a>
@@ -3702,7 +3702,7 @@ <h3 class="accordion-header" id="headingInstructor1">
   Instructor Note
   </h3>
 </button>
-<div id="collapseInstructor1" class="accordion-collapse collapse" data-bs-parent="#accordionInstructor1" aria-labelledby="headingInstructor1">
+<div id="collapseInstructor1" class="accordion-collapse collapse" aria-labelledby="headingInstructor1" data-bs-parent="#accordionInstructor1">
 <div class="accordion-body">
 <p>Browse through EOSC Portal to find some datasets and publications,
 and answer the following questions.</p>
@@ -3737,7 +3737,7 @@ <h4 class="accordion-header" id="headingHint1">
   Give me a hint
   </h4>
 </button>
-<div id="collapseHint1" class="accordion-collapse collapse" data-bs-parent="#accordionHint1" aria-labelledby="headingHint1">
+<div id="collapseHint1" class="accordion-collapse collapse" aria-labelledby="headingHint1" data-bs-parent="#accordionHint1">
 <div class="accordion-body">
 <p>Browse through <a href="https://eosc-portal.eu/" class="external-link">EOSC Portal</a> to
 answer the previous questions.</p>
@@ -3752,7 +3752,7 @@ <h4 class="accordion-header" id="headingSolution1">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
 <div class="accordion-body">
 <p>R1) This paper was published on <a href="https://explore.eosc-portal.eu/search/dataset?pid=10.26093%2Fcds%2Fvizier.17970082&amp;return_path=search%2Fall&amp;search_params=q%3DNGTS%2520clusters%2520survey" class="external-link">01
 Jan 2017</a>.</p>
diff --git a/instructor/images.html b/instructor/images.html
index 781d2fde..f00f6f42 100644
--- a/instructor/images.html
+++ b/instructor/images.html
@@ -460,27 +460,27 @@ <h3 id="section_eosc-figure-1">Figure 1</h3>
 step 5 “integration into the IVOA, EUDAT and finally EOSC”</figcaption></figure><hr>
 <h3 id="section_eosc-figure-2">Figure 2</h3>
 <p aria-hidden="true">Image 1 of 1: ‘Screenshot: EOSC Portal homepage, from September 2023’</p>
-<figure><img src="https://raw.githubusercontent.com/cds-astro/a-FAIR-journey-for-astronomical-data/main/episodes/images/eosc_portal_june23/eosc_portal__main_page.png" alt="Screenshot: EOSC Portal homepage, from September 2023" class="figure mx-auto d-block"><figcaption>Figure: EOSC Portal homepage (screenshot from
+<figure><img src="https://raw.githubusercontent.com/cds-astro/a-FAIR-journey-for-astronomical-data/main/episodes/images/eosc_portal_sept23/eosc_portal__main_page.png" alt="Screenshot: EOSC Portal homepage, from September 2023" class="figure mx-auto d-block"><figcaption>Figure: EOSC Portal homepage (screenshot from
 September 2023)</figcaption></figure><hr>
 <h3 id="section_eosc-figure-3">Figure 3</h3>
 <p aria-hidden="true">Image 1 of 1: ‘Screenshot: EOSC Portal search for 'Gaia DR3' using homepage, from September 2023’</p>
-<figure><img src="https://raw.githubusercontent.com/cds-astro/a-FAIR-journey-for-astronomical-data/main/episodes/images/eosc_portal_june23/case_study__gaia_dr3__step1_search.png" alt="Screenshot: EOSC Portal search for 'Gaia DR3' using homepage, from September 2023" class="figure mx-auto d-block"><figcaption>Figure: Searching for ‘Gaia DR3’ on EOSC Portal –
+<figure><img src="https://raw.githubusercontent.com/cds-astro/a-FAIR-journey-for-astronomical-data/main/episodes/images/eosc_portal_sept23/case_study__gaia_dr3__step1_search.png" alt="Screenshot: EOSC Portal search for 'Gaia DR3' using homepage, from September 2023" class="figure mx-auto d-block"><figcaption>Figure: Searching for ‘Gaia DR3’ on EOSC Portal –
 search from homepage (screenshot from September 2023)</figcaption></figure><hr>
 <h3 id="section_eosc-figure-4">Figure 4</h3>
 <p aria-hidden="true">Image 1 of 1: ‘Screenshot: EOSC Portal search for 'Gaia DR3' using 'Browse Marketplace' page, from September 2023’</p>
-<figure><img src="https://raw.githubusercontent.com/cds-astro/a-FAIR-journey-for-astronomical-data/main/episodes/images/eosc_portal_june23/case_study__gaia_dr3__step1_search_browse_marketplace.png" alt="Screenshot: EOSC Portal search for 'Gaia DR3' using 'Browse Marketplace' page, from September 2023" class="figure mx-auto d-block"><figcaption>Figure: Searching for ‘Gaia DR3’ on EOSC Portal –
+<figure><img src="https://raw.githubusercontent.com/cds-astro/a-FAIR-journey-for-astronomical-data/main/episodes/images/eosc_portal_sept23/case_study__gaia_dr3__step1_search_browse_marketplace.png" alt="Screenshot: EOSC Portal search for 'Gaia DR3' using 'Browse Marketplace' page, from September 2023" class="figure mx-auto d-block"><figcaption>Figure: Searching for ‘Gaia DR3’ on EOSC Portal –
 Browse Marketplace tab (screenshot from September 2023)</figcaption></figure><hr>
 <h3 id="section_eosc-figure-5">Figure 5</h3>
 <p aria-hidden="true">Image 1 of 1: ‘Screenshot: EOSC Portal search for 'Gaia DR3' -- scanning through all the records, from September 2023’</p>
-<figure><img src="https://raw.githubusercontent.com/cds-astro/a-FAIR-journey-for-astronomical-data/main/episodes/images/eosc_portal_june23/case_study__gaia_dr3__step2_all_records.png" alt="Screenshot: EOSC Portal search for 'Gaia DR3' -- scanning through all the records, from September 2023" class="figure mx-auto d-block"><figcaption>Figure: Searching for ‘Gaia DR3’ on EOSC Portal – all
+<figure><img src="https://raw.githubusercontent.com/cds-astro/a-FAIR-journey-for-astronomical-data/main/episodes/images/eosc_portal_sept23/case_study__gaia_dr3__step2_all_records.png" alt="Screenshot: EOSC Portal search for 'Gaia DR3' -- scanning through all the records, from September 2023" class="figure mx-auto d-block"><figcaption>Figure: Searching for ‘Gaia DR3’ on EOSC Portal – all
 records (screenshot from September 2023)</figcaption></figure><hr>
 <h3 id="section_eosc-figure-6">Figure 6</h3>
 <p aria-hidden="true">Image 1 of 1: ‘Screenshot: EOSC Portal search for 'Gaia DR3' -- scanning through all the records and filtering using the 'advanced search' option, from September 2023’</p>
-<figure><img src="https://raw.githubusercontent.com/cds-astro/a-FAIR-journey-for-astronomical-data/main/episodes/images/eosc_portal_june23/case_study__gaia_dr3__step2_all_records_advanced_filtering.png" alt="Screenshot: EOSC Portal search for 'Gaia DR3' -- scanning through all the records and filtering using the 'advanced search' option, from September 2023" class="figure mx-auto d-block"><figcaption>Figure: Searching for ‘Gaia DR3’ on EOSC Portal – all
+<figure><img src="https://raw.githubusercontent.com/cds-astro/a-FAIR-journey-for-astronomical-data/main/episodes/images/eosc_portal_sept23/case_study__gaia_dr3__step2_all_records_advanced_filtering.png" alt="Screenshot: EOSC Portal search for 'Gaia DR3' -- scanning through all the records and filtering using the 'advanced search' option, from September 2023" class="figure mx-auto d-block"><figcaption>Figure: Searching for ‘Gaia DR3’ on EOSC Portal – all
 records, with extra filtering (screenshot from September 2023)</figcaption></figure><hr>
 <h3 id="section_eosc-figure-7">Figure 7</h3>
 <p aria-hidden="true">Image 1 of 1: ‘Screenshot: EOSC Portal search for 'Gaia DR3', from September 2023’</p>
-<figure><img src="https://raw.githubusercontent.com/cds-astro/a-FAIR-journey-for-astronomical-data/main/episodes/images/eosc_portal_june23/case_study__gaia_dr3__step3_result.png" alt="Screenshot: EOSC Portal search for 'Gaia DR3', from September 2023" class="figure mx-auto d-block"><figcaption>Figure: Searching for ‘Gaia DR3’ on EOSC Portal –
+<figure><img src="https://raw.githubusercontent.com/cds-astro/a-FAIR-journey-for-astronomical-data/main/episodes/images/eosc_portal_sept23/case_study__gaia_dr3__step3_result.png" alt="Screenshot: EOSC Portal search for 'Gaia DR3', from September 2023" class="figure mx-auto d-block"><figcaption>Figure: Searching for ‘Gaia DR3’ on EOSC Portal –
 result (screenshot from September 2023)</figcaption></figure><hr></section>
 </div>
     </main>
diff --git a/instructor/section_eosc.html b/instructor/section_eosc.html
index defe826e..a38dce54 100644
--- a/instructor/section_eosc.html
+++ b/instructor/section_eosc.html
@@ -374,7 +374,7 @@ <h3 class="card-title">Objectives</h3>
 materials and tutorials on how to use its features. The Portal also
 offers information for potential service providers on how to onboard
 their services to the EOSC Portal Catalogue &amp; Marketplace.</p>
-<figure><img src="https://raw.githubusercontent.com/cds-astro/a-FAIR-journey-for-astronomical-data/main/episodes/images/eosc_portal_june23/eosc_portal__main_page.png" alt="Screenshot: EOSC Portal homepage, from September 2023" class="figure mx-auto d-block"><figcaption>Figure: EOSC Portal homepage (screenshot from
+<figure><img src="https://raw.githubusercontent.com/cds-astro/a-FAIR-journey-for-astronomical-data/main/episodes/images/eosc_portal_sept23/eosc_portal__main_page.png" alt="Screenshot: EOSC Portal homepage, from September 2023" class="figure mx-auto d-block"><figcaption>Figure: EOSC Portal homepage (screenshot from
 September 2023)</figcaption></figure><!--  ----------------------------------------- --><!--            Case study 	                --><!--  ----------------------------------------- --></section><section id="case-study-gaia-dr3"><h2 class="section-heading">Case Study: Gaia DR3<a class="anchor" aria-label="anchor" href="#case-study-gaia-dr3"></a>
 </h2>
 <hr class="half-width"><p>In the following, we will show how to find your data in EOSC, using
@@ -385,11 +385,11 @@ <h3 id="step-1-search">Step 1: Search<a class="anchor" aria-label="anchor" href=
 <p>The first step is to type the name of your catalogue, dataset, paper,
 DOI in the Search bar on <a href="https://eosc-portal.eu/" class="external-link">EOSC
 portal</a>, as illustrated in the figure below.</p>
-<figure><img src="https://raw.githubusercontent.com/cds-astro/a-FAIR-journey-for-astronomical-data/main/episodes/images/eosc_portal_june23/case_study__gaia_dr3__step1_search.png" alt="Screenshot: EOSC Portal search for 'Gaia DR3' using homepage, from September 2023" class="figure mx-auto d-block"><figcaption>Figure: Searching for ‘Gaia DR3’ on EOSC Portal –
+<figure><img src="https://raw.githubusercontent.com/cds-astro/a-FAIR-journey-for-astronomical-data/main/episodes/images/eosc_portal_sept23/case_study__gaia_dr3__step1_search.png" alt="Screenshot: EOSC Portal search for 'Gaia DR3' using homepage, from September 2023" class="figure mx-auto d-block"><figcaption>Figure: Searching for ‘Gaia DR3’ on EOSC Portal –
 search from homepage (screenshot from September 2023)</figcaption></figure><p>You can also <a href="https://marketplace.eosc-portal.eu/" class="external-link">browse
 directly the Marketplace</a>, from the same website. You will get the
 same results in the end.</p>
-<figure><img src="https://raw.githubusercontent.com/cds-astro/a-FAIR-journey-for-astronomical-data/main/episodes/images/eosc_portal_june23/case_study__gaia_dr3__step1_search_browse_marketplace.png" alt="Screenshot: EOSC Portal search for 'Gaia DR3' using 'Browse Marketplace' page, from September 2023" class="figure mx-auto d-block"><figcaption>Figure: Searching for ‘Gaia DR3’ on EOSC Portal –
+<figure><img src="https://raw.githubusercontent.com/cds-astro/a-FAIR-journey-for-astronomical-data/main/episodes/images/eosc_portal_sept23/case_study__gaia_dr3__step1_search_browse_marketplace.png" alt="Screenshot: EOSC Portal search for 'Gaia DR3' using 'Browse Marketplace' page, from September 2023" class="figure mx-auto d-block"><figcaption>Figure: Searching for ‘Gaia DR3’ on EOSC Portal –
 Browse Marketplace tab (screenshot from September 2023)</figcaption></figure><hr><hr></div>
 <div class="section level3">
 <h3 id="step-2-scan-list-of-records">Step 2: Scan list of records<a class="anchor" aria-label="anchor" href="#step-2-scan-list-of-records"></a></h3>
@@ -399,7 +399,7 @@ <h3 id="step-2-scan-list-of-records">Step 2: Scan list of records<a class="ancho
 data at the top (eg. Catalogs, Publications, Data, Software …).</p>
 <p>In our example (Gaia DR3), we can see that the search is done on
 multiple fields: Title, Author names, abstract.</p>
-<figure><img src="https://raw.githubusercontent.com/cds-astro/a-FAIR-journey-for-astronomical-data/main/episodes/images/eosc_portal_june23/case_study__gaia_dr3__step2_all_records.png" alt="Screenshot: EOSC Portal search for 'Gaia DR3' -- scanning through all the records, from September 2023" class="figure mx-auto d-block"><figcaption>Figure: Searching for ‘Gaia DR3’ on EOSC Portal – all
+<figure><img src="https://raw.githubusercontent.com/cds-astro/a-FAIR-journey-for-astronomical-data/main/episodes/images/eosc_portal_sept23/case_study__gaia_dr3__step2_all_records.png" alt="Screenshot: EOSC Portal search for 'Gaia DR3' -- scanning through all the records, from September 2023" class="figure mx-auto d-block"><figcaption>Figure: Searching for ‘Gaia DR3’ on EOSC Portal – all
 records (screenshot from September 2023)</figcaption></figure><hr><!-- --------------------- --></div>
 <div class="section level3">
 <h3 id="advanced-search">Advanced search<a class="anchor" aria-label="anchor" href="#advanced-search"></a></h3>
@@ -408,7 +408,7 @@ <h3 id="advanced-search">Advanced search<a class="anchor" aria-label="anchor" hr
 the ‘Show Advanced Search’ button below the main Search bar.</p>
 <p>The search can be narrowed by ‘author’, ‘exact phrase’, ‘in title’,
 ‘none of’, as illustrated in the Figure below.</p>
-<figure><img src="https://raw.githubusercontent.com/cds-astro/a-FAIR-journey-for-astronomical-data/main/episodes/images/eosc_portal_june23/case_study__gaia_dr3__step2_all_records_advanced_filtering.png" alt="Screenshot: EOSC Portal search for 'Gaia DR3' -- scanning through all the records and filtering using the 'advanced search' option, from September 2023" class="figure mx-auto d-block"><figcaption>Figure: Searching for ‘Gaia DR3’ on EOSC Portal – all
+<figure><img src="https://raw.githubusercontent.com/cds-astro/a-FAIR-journey-for-astronomical-data/main/episodes/images/eosc_portal_sept23/case_study__gaia_dr3__step2_all_records_advanced_filtering.png" alt="Screenshot: EOSC Portal search for 'Gaia DR3' -- scanning through all the records and filtering using the 'advanced search' option, from September 2023" class="figure mx-auto d-block"><figcaption>Figure: Searching for ‘Gaia DR3’ on EOSC Portal – all
 records, with extra filtering (screenshot from September 2023)</figcaption></figure><hr><hr></div>
 <div class="section level3">
 <h3 id="step-3-select-an-entry">Step 3: Select an entry<a class="anchor" aria-label="anchor" href="#step-3-select-an-entry"></a></h3>
@@ -422,7 +422,7 @@ <h3 id="step-3-select-an-entry">Step 3: Select an entry<a class="anchor" aria-la
 select one of the two data sources available: <a href="https://doi.org/http://doi.org/10.26093/cds/vizier.1355" class="external-link">B2FIND</a>
 or <a href="https://doi.org/10.26093/cds/vizier.1355" class="external-link">Strasbourg
 Astronomical Data Center</a>.</p>
-<figure><img src="https://raw.githubusercontent.com/cds-astro/a-FAIR-journey-for-astronomical-data/main/episodes/images/eosc_portal_june23/case_study__gaia_dr3__step3_result.png" alt="Screenshot: EOSC Portal search for 'Gaia DR3', from September 2023" class="figure mx-auto d-block"><figcaption>Figure: Searching for ‘Gaia DR3’ on EOSC Portal –
+<figure><img src="https://raw.githubusercontent.com/cds-astro/a-FAIR-journey-for-astronomical-data/main/episodes/images/eosc_portal_sept23/case_study__gaia_dr3__step3_result.png" alt="Screenshot: EOSC Portal search for 'Gaia DR3', from September 2023" class="figure mx-auto d-block"><figcaption>Figure: Searching for ‘Gaia DR3’ on EOSC Portal –
 result (screenshot from September 2023)</figcaption></figure><!--  ----------------------------------------- --><!--            Example				--><!--  ----------------------------------------- --></div>
 </section><section id="examples-try-it-yourself"><h2 class="section-heading">Examples: try it yourself<a class="anchor" aria-label="anchor" href="#examples-try-it-yourself"></a>
 </h2>
@@ -434,7 +434,7 @@ <h3 class="accordion-header" id="headingInstructor1">
   Instructor Note
   </h3>
 </button>
-<div id="collapseInstructor1" class="accordion-collapse collapse" data-bs-parent="#accordionInstructor1" aria-labelledby="headingInstructor1">
+<div id="collapseInstructor1" class="accordion-collapse collapse" aria-labelledby="headingInstructor1" data-bs-parent="#accordionInstructor1">
 <div class="accordion-body">
 <p>Browse through EOSC Portal to find some datasets and publications,
 and answer the following questions.</p>
@@ -469,7 +469,7 @@ <h4 class="accordion-header" id="headingHint1">
   Give me a hint
   </h4>
 </button>
-<div id="collapseHint1" class="accordion-collapse collapse" data-bs-parent="#accordionHint1" aria-labelledby="headingHint1">
+<div id="collapseHint1" class="accordion-collapse collapse" aria-labelledby="headingHint1" data-bs-parent="#accordionHint1">
 <div class="accordion-body">
 <p>Browse through <a href="https://eosc-portal.eu/" class="external-link">EOSC Portal</a> to
 answer the previous questions.</p>
@@ -484,7 +484,7 @@ <h4 class="accordion-header" id="headingSolution1">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
 <div class="accordion-body">
 <p>R1) This paper was published on <a href="https://explore.eosc-portal.eu/search/dataset?pid=10.26093%2Fcds%2Fvizier.17970082&amp;return_path=search%2Fall&amp;search_params=q%3DNGTS%2520clusters%2520survey" class="external-link">01
 Jan 2017</a>.</p>
diff --git a/instructor/section_prepare_data.html b/instructor/section_prepare_data.html
index 30e95fbe..4c2ba010 100644
--- a/instructor/section_prepare_data.html
+++ b/instructor/section_prepare_data.html
@@ -564,7 +564,7 @@ <h3 class="accordion-header" id="headingInstructor1">
   Instructor Note
   </h3>
 </button>
-<div id="collapseInstructor1" class="accordion-collapse collapse" aria-labelledby="headingInstructor1" data-bs-parent="#accordionInstructor1">
+<div id="collapseInstructor1" class="accordion-collapse collapse" data-bs-parent="#accordionInstructor1" aria-labelledby="headingInstructor1">
 <div class="accordion-body">
 <p>Show some good and bad examples of filenames.</p>
 </div>
@@ -596,7 +596,7 @@ <h4 class="accordion-header" id="headingSolution1">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
 <div class="accordion-body">
 <p>R1) No: filenames should be in lowercase.</p>
 <p>R2) No: filename too long. This filename will be shortened afterwards
diff --git a/instructor/section_submit_data.html b/instructor/section_submit_data.html
index 8b6650e9..0d09120c 100644
--- a/instructor/section_submit_data.html
+++ b/instructor/section_submit_data.html
@@ -477,7 +477,7 @@ <h4 class="accordion-header" id="headingSolution1">
   A. ‘Title of the paper’, ‘Authors’, ‘Reference’
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
 <div class="accordion-body">
 <ul><li>
 <strong>Title of the paper</strong>: Title as written in paper</li>
@@ -498,7 +498,7 @@ <h4 class="accordion-header" id="headingSolution2">
   B. ‘Abstract’ and ‘Description’
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
 <div class="accordion-body">
 <ul><li>
 <strong>Abstract</strong>: Describes the <em>scientific results</em>
@@ -523,7 +523,7 @@ <h4 class="accordion-header" id="headingSolution3">
   C. ‘Byte-by-byte Description of file’
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
 <div class="accordion-body">
 <p>This section describes the structure of each data files (files with
 the .dat extension). This description is made in a tabular form, each
diff --git a/md5sum.txt b/md5sum.txt
index fec23154..32cfdf2e 100644
--- a/md5sum.txt
+++ b/md5sum.txt
@@ -10,7 +10,7 @@
 "episodes/section_prepare_data.md" "b7f94f8f64eb16a7c34f84cc2dffa90c" "site/built/section_prepare_data.md" "2023-09-06"
 "episodes/section_submit_data.md" "d2878ce99da9eabba0e161913548ef67" "site/built/section_submit_data.md" "2023-09-06"
 "episodes/section_data_curation.md" "f238898b834973b21a85b16e49af37eb" "site/built/section_data_curation.md" "2023-09-07"
-"episodes/section_eosc.md" "56497cd1e6d72b6170f198b811960b60" "site/built/section_eosc.md" "2023-09-07"
+"episodes/section_eosc.md" "602f27426f3498b4beeb9b8b0ee4a4b1" "site/built/section_eosc.md" "2023-09-07"
 "instructors/instructor-notes.md" "60b93493cf1da06dfd63255d73854461" "site/built/instructor-notes.md" "2022-04-22"
 "learners/setup.md" "32b0d8d3e460d9892e2e38ac4a34b48f" "site/built/setup.md" "2023-09-06"
 "learners/reference.md" "bfa491f8cf0002c2efaeb527354f5b14" "site/built/reference.md" "2023-08-30"
diff --git a/pkgdown.yml b/pkgdown.yml
index c0beda57..7127c500 100644
--- a/pkgdown.yml
+++ b/pkgdown.yml
@@ -2,5 +2,5 @@ pandoc: 2.19.2
 pkgdown: 2.0.7
 pkgdown_sha: ~
 articles: {}
-last_built: 2023-09-07T10:03Z
+last_built: 2023-09-07T10:10Z
 
diff --git a/section_eosc.html b/section_eosc.html
index 703f4c33..b1320fc1 100644
--- a/section_eosc.html
+++ b/section_eosc.html
@@ -373,7 +373,7 @@ <h3 class="card-title">Objectives</h3>
 materials and tutorials on how to use its features. The Portal also
 offers information for potential service providers on how to onboard
 their services to the EOSC Portal Catalogue &amp; Marketplace.</p>
-<figure><img src="https://raw.githubusercontent.com/cds-astro/a-FAIR-journey-for-astronomical-data/main/episodes/images/eosc_portal_june23/eosc_portal__main_page.png" alt="Screenshot: EOSC Portal homepage, from September 2023" class="figure mx-auto d-block"><figcaption>Figure: EOSC Portal homepage (screenshot from
+<figure><img src="https://raw.githubusercontent.com/cds-astro/a-FAIR-journey-for-astronomical-data/main/episodes/images/eosc_portal_sept23/eosc_portal__main_page.png" alt="Screenshot: EOSC Portal homepage, from September 2023" class="figure mx-auto d-block"><figcaption>Figure: EOSC Portal homepage (screenshot from
 September 2023)</figcaption></figure><!--  ----------------------------------------- --><!--            Case study 	                --><!--  ----------------------------------------- --></section><section id="case-study-gaia-dr3"><h2 class="section-heading">Case Study: Gaia DR3<a class="anchor" aria-label="anchor" href="#case-study-gaia-dr3"></a>
 </h2>
 <hr class="half-width"><p>In the following, we will show how to find your data in EOSC, using
@@ -384,11 +384,11 @@ <h3 id="step-1-search">Step 1: Search<a class="anchor" aria-label="anchor" href=
 <p>The first step is to type the name of your catalogue, dataset, paper,
 DOI in the Search bar on <a href="https://eosc-portal.eu/" class="external-link">EOSC
 portal</a>, as illustrated in the figure below.</p>
-<figure><img src="https://raw.githubusercontent.com/cds-astro/a-FAIR-journey-for-astronomical-data/main/episodes/images/eosc_portal_june23/case_study__gaia_dr3__step1_search.png" alt="Screenshot: EOSC Portal search for 'Gaia DR3' using homepage, from September 2023" class="figure mx-auto d-block"><figcaption>Figure: Searching for ‘Gaia DR3’ on EOSC Portal –
+<figure><img src="https://raw.githubusercontent.com/cds-astro/a-FAIR-journey-for-astronomical-data/main/episodes/images/eosc_portal_sept23/case_study__gaia_dr3__step1_search.png" alt="Screenshot: EOSC Portal search for 'Gaia DR3' using homepage, from September 2023" class="figure mx-auto d-block"><figcaption>Figure: Searching for ‘Gaia DR3’ on EOSC Portal –
 search from homepage (screenshot from September 2023)</figcaption></figure><p>You can also <a href="https://marketplace.eosc-portal.eu/" class="external-link">browse
 directly the Marketplace</a>, from the same website. You will get the
 same results in the end.</p>
-<figure><img src="https://raw.githubusercontent.com/cds-astro/a-FAIR-journey-for-astronomical-data/main/episodes/images/eosc_portal_june23/case_study__gaia_dr3__step1_search_browse_marketplace.png" alt="Screenshot: EOSC Portal search for 'Gaia DR3' using 'Browse Marketplace' page, from September 2023" class="figure mx-auto d-block"><figcaption>Figure: Searching for ‘Gaia DR3’ on EOSC Portal –
+<figure><img src="https://raw.githubusercontent.com/cds-astro/a-FAIR-journey-for-astronomical-data/main/episodes/images/eosc_portal_sept23/case_study__gaia_dr3__step1_search_browse_marketplace.png" alt="Screenshot: EOSC Portal search for 'Gaia DR3' using 'Browse Marketplace' page, from September 2023" class="figure mx-auto d-block"><figcaption>Figure: Searching for ‘Gaia DR3’ on EOSC Portal –
 Browse Marketplace tab (screenshot from September 2023)</figcaption></figure><hr><hr></div>
 <div class="section level3">
 <h3 id="step-2-scan-list-of-records">Step 2: Scan list of records<a class="anchor" aria-label="anchor" href="#step-2-scan-list-of-records"></a></h3>
@@ -398,7 +398,7 @@ <h3 id="step-2-scan-list-of-records">Step 2: Scan list of records<a class="ancho
 data at the top (eg. Catalogs, Publications, Data, Software …).</p>
 <p>In our example (Gaia DR3), we can see that the search is done on
 multiple fields: Title, Author names, abstract.</p>
-<figure><img src="https://raw.githubusercontent.com/cds-astro/a-FAIR-journey-for-astronomical-data/main/episodes/images/eosc_portal_june23/case_study__gaia_dr3__step2_all_records.png" alt="Screenshot: EOSC Portal search for 'Gaia DR3' -- scanning through all the records, from September 2023" class="figure mx-auto d-block"><figcaption>Figure: Searching for ‘Gaia DR3’ on EOSC Portal – all
+<figure><img src="https://raw.githubusercontent.com/cds-astro/a-FAIR-journey-for-astronomical-data/main/episodes/images/eosc_portal_sept23/case_study__gaia_dr3__step2_all_records.png" alt="Screenshot: EOSC Portal search for 'Gaia DR3' -- scanning through all the records, from September 2023" class="figure mx-auto d-block"><figcaption>Figure: Searching for ‘Gaia DR3’ on EOSC Portal – all
 records (screenshot from September 2023)</figcaption></figure><hr><!-- --------------------- --></div>
 <div class="section level3">
 <h3 id="advanced-search">Advanced search<a class="anchor" aria-label="anchor" href="#advanced-search"></a></h3>
@@ -407,7 +407,7 @@ <h3 id="advanced-search">Advanced search<a class="anchor" aria-label="anchor" hr
 the ‘Show Advanced Search’ button below the main Search bar.</p>
 <p>The search can be narrowed by ‘author’, ‘exact phrase’, ‘in title’,
 ‘none of’, as illustrated in the Figure below.</p>
-<figure><img src="https://raw.githubusercontent.com/cds-astro/a-FAIR-journey-for-astronomical-data/main/episodes/images/eosc_portal_june23/case_study__gaia_dr3__step2_all_records_advanced_filtering.png" alt="Screenshot: EOSC Portal search for 'Gaia DR3' -- scanning through all the records and filtering using the 'advanced search' option, from September 2023" class="figure mx-auto d-block"><figcaption>Figure: Searching for ‘Gaia DR3’ on EOSC Portal – all
+<figure><img src="https://raw.githubusercontent.com/cds-astro/a-FAIR-journey-for-astronomical-data/main/episodes/images/eosc_portal_sept23/case_study__gaia_dr3__step2_all_records_advanced_filtering.png" alt="Screenshot: EOSC Portal search for 'Gaia DR3' -- scanning through all the records and filtering using the 'advanced search' option, from September 2023" class="figure mx-auto d-block"><figcaption>Figure: Searching for ‘Gaia DR3’ on EOSC Portal – all
 records, with extra filtering (screenshot from September 2023)</figcaption></figure><hr><hr></div>
 <div class="section level3">
 <h3 id="step-3-select-an-entry">Step 3: Select an entry<a class="anchor" aria-label="anchor" href="#step-3-select-an-entry"></a></h3>
@@ -421,7 +421,7 @@ <h3 id="step-3-select-an-entry">Step 3: Select an entry<a class="anchor" aria-la
 select one of the two data sources available: <a href="https://doi.org/http://doi.org/10.26093/cds/vizier.1355" class="external-link">B2FIND</a>
 or <a href="https://doi.org/10.26093/cds/vizier.1355" class="external-link">Strasbourg
 Astronomical Data Center</a>.</p>
-<figure><img src="https://raw.githubusercontent.com/cds-astro/a-FAIR-journey-for-astronomical-data/main/episodes/images/eosc_portal_june23/case_study__gaia_dr3__step3_result.png" alt="Screenshot: EOSC Portal search for 'Gaia DR3', from September 2023" class="figure mx-auto d-block"><figcaption>Figure: Searching for ‘Gaia DR3’ on EOSC Portal –
+<figure><img src="https://raw.githubusercontent.com/cds-astro/a-FAIR-journey-for-astronomical-data/main/episodes/images/eosc_portal_sept23/case_study__gaia_dr3__step3_result.png" alt="Screenshot: EOSC Portal search for 'Gaia DR3', from September 2023" class="figure mx-auto d-block"><figcaption>Figure: Searching for ‘Gaia DR3’ on EOSC Portal –
 result (screenshot from September 2023)</figcaption></figure><!--  ----------------------------------------- --><!--            Example				--><!--  ----------------------------------------- --></div>
 </section><section id="examples-try-it-yourself"><h2 class="section-heading">Examples: try it yourself<a class="anchor" aria-label="anchor" href="#examples-try-it-yourself"></a>
 </h2>
@@ -452,7 +452,7 @@ <h4 class="accordion-header" id="headingHint1">
   Give me a hint
   </h4>
 </button>
-<div id="collapseHint1" class="accordion-collapse collapse" data-bs-parent="#accordionHint1" aria-labelledby="headingHint1">
+<div id="collapseHint1" class="accordion-collapse collapse" aria-labelledby="headingHint1" data-bs-parent="#accordionHint1">
 <div class="accordion-body">
 <p>Browse through <a href="https://eosc-portal.eu/" class="external-link">EOSC Portal</a> to
 answer the previous questions.</p>
@@ -467,7 +467,7 @@ <h4 class="accordion-header" id="headingSolution1">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
 <div class="accordion-body">
 <p>R1) This paper was published on <a href="https://explore.eosc-portal.eu/search/dataset?pid=10.26093%2Fcds%2Fvizier.17970082&amp;return_path=search%2Fall&amp;search_params=q%3DNGTS%2520clusters%2520survey" class="external-link">01
 Jan 2017</a>.</p>
diff --git a/section_prepare_data.html b/section_prepare_data.html
index 2048db46..e669cc7c 100644
--- a/section_prepare_data.html
+++ b/section_prepare_data.html
@@ -581,7 +581,7 @@ <h4 class="accordion-header" id="headingSolution1">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
 <div class="accordion-body">
 <p>R1) No: filenames should be in lowercase.</p>
 <p>R2) No: filename too long. This filename will be shortened afterwards
diff --git a/section_submit_data.html b/section_submit_data.html
index 4122d989..5dc46a2e 100644
--- a/section_submit_data.html
+++ b/section_submit_data.html
@@ -476,7 +476,7 @@ <h4 class="accordion-header" id="headingSolution1">
   A. ‘Title of the paper’, ‘Authors’, ‘Reference’
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
 <div class="accordion-body">
 <ul><li>
 <strong>Title of the paper</strong>: Title as written in paper</li>
@@ -497,7 +497,7 @@ <h4 class="accordion-header" id="headingSolution2">
   B. ‘Abstract’ and ‘Description’
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
 <div class="accordion-body">
 <ul><li>
 <strong>Abstract</strong>: Describes the <em>scientific results</em>
@@ -522,7 +522,7 @@ <h4 class="accordion-header" id="headingSolution3">
   C. ‘Byte-by-byte Description of file’
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
 <div class="accordion-body">
 <p>This section describes the structure of each data files (files with
 the .dat extension). This description is made in a tabular form, each