added the ppm unit for legend in GEOS dataset

datasets/epa-ch4emission-yeargrid-v2express.data.mdx

@@ -66,7 +66,7 @@ layers:
       unit:
         label: Mg CH₄/km²/yr
       type: gradient
-      min: 0s
+      min: 0
       max: 20
       stops:
         - "#6F4C9B"
@@ -356,7 +356,7 @@ layers:
       colormap_name: epa-ghgi-ch4
       rescale:
         - 0
-        - 20
+        - 0.24
       # nodata: -9999
     compare:
       datasetId: epa-ch4emission-yeargrid-v2express
@@ -2049,7 +2049,7 @@ layers:
       rescale:
         - 0
         - 20
-      # nodata: -9999
+      nodata: -9999
     compare:
       datasetId: epa-ch4emission-yeargrid-v2express
       layerId: 1A-ferroalloy-production-other
@@ -2108,7 +2108,7 @@ layers:
     Previous Versions
       - A. Gridded methane GHGI Version 1 (0.1°×0.1° annual emission maps for 2012, consistent with the 2016 U.S. GHGI)
 
-    Data available on the Data Explorer page correspond to the V2 Express Extension dataset . 
+    Data available on the Data Explorer page correspond to the V2 Express Extension dataset. 
 
     For more information on the current data set versions, see the associated publication: [Massakkers et al., 2023.](https://pubs.acs.org/doi/full/10.1021/acs.est.3c05138) or visit the [EPA gridded inventory webpage](https://www.epa.gov/ghgemissions/us-gridded-methane-emissions). For more information on the previous version, see the associated publication: [Massakkers et al., 2016.](https://pubs.acs.org/doi/10.1021/acs.est.6b02878)   
 

datasets/oco2geos-co2-daygrid-v10r.data.mdx

@@ -64,7 +64,7 @@ layers:
         }
     legend:
       unit:
-        label:ppm
+        label : ppm
       type: gradient
       min: 412
       max: 422