diff --git a/src/nested/map/img.rs b/src/nested/map/img.rs
index 25b7697..cefbc5b 100644
--- a/src/nested/map/img.rs
+++ b/src/nested/map/img.rs
@@ -615,7 +615,7 @@ where
       if let Some(lonlat) = img2cel.img2lonlat(&ImgXY::new(x as f64, y as f64)) {
         let (lon, lat) = imgpos2mappos(lonlat.lon(), lonlat.lat());
         let idx = hpx.hash(lon, lat);
-        let color = if let Some((z_, val)) = mom
+        let color = if let Some((_, val)) = mom
           .get_cell_containing_unsafe(M::ZUniqHType::to_zuniq(depth, M::ZUniqHType::from_u64(idx)))
         {
           color_map.eval_continuous(color_map_func.value(val.to_f64()))
@@ -848,7 +848,7 @@ where
 /// * `path`: the path of th PNG file to be written.
 /// * `view`: set to true to visualize the saved image.
 #[cfg(not(target_arch = "wasm32"))]
-pub fn to_mom_png_file<'a, M, P>(
+pub fn to_mom_png_file<'a, M, P, A>(
   mom: &'a M,
   img_size: (u16, u16),
   proj: Option<P>,
@@ -857,17 +857,18 @@ pub fn to_mom_png_file<'a, M, P>(
   pos_convert: Option<PosConversion>,
   color_map: Option<Gradient>,
   color_map_func_type: Option<ColorMapFunctionType>,
-  path: &Path,
+  path: A,
   view: bool,
 ) -> Result<(), Box<dyn Error>>
 where
   P: CanonicalProjection,
   M: Mom<'a>,
   M::ValueType: Val,
+  A: AsRef<Path>,
 {
   // Brackets are important to be sure the file is closed before trying to open it.
   {
-    let file = File::create(path)?;
+    let file = File::create(path.as_ref())?;
     let mut writer = BufWriter::new(file);
     to_mom_png(
       mom,
@@ -882,7 +883,7 @@ where
     )?;
   }
   if view {
-    show_with_default_app(path.to_string_lossy().as_ref())?;
+    show_with_default_app(path.as_ref().to_string_lossy().as_ref())?;
   }
   Ok(())
 }
diff --git a/src/nested/map/mom/impls/zvec.rs b/src/nested/map/mom/impls/zvec.rs
index f40fefd..00f56b7 100644
--- a/src/nested/map/mom/impls/zvec.rs
+++ b/src/nested/map/mom/impls/zvec.rs
@@ -1,4 +1,3 @@
-use std::os::linux::raw::stat;
 use std::{iter::Map, slice::Iter};
 
 use super::super::{
@@ -194,17 +193,16 @@ where
 
 #[cfg(test)]
 mod tests {
-  use std::{f64::consts::PI, path::Path};
+  use std::f64::consts::PI;
 
   use mapproj::pseudocyl::mol::Mol;
-  use num::integer::Roots;
 
   use crate::{
     n_hash,
     nested::map::{
       img::{to_mom_png_file, ColorMapFunctionType, PosConversion},
-      mom::{impls::zvec::MomVecImpl, Mom, ZUniqHashT},
-      skymap::{SkyMap, SkyMapEnum},
+      mom::{impls::zvec::MomVecImpl, ZUniqHashT},
+      skymap::SkyMapEnum,
     },
   };
 
@@ -246,7 +244,7 @@ mod tests {
             .collect::<Vec<(u64, f64)>>(),
         };
 
-        to_mom_png_file::<'_, _, Mol>(
+        to_mom_png_file::<'_, _, Mol, _>(
           &mom,
           (1600, 800),
           None,
@@ -255,7 +253,7 @@ mod tests {
           Some(PosConversion::EqMap2GalImg),
           None,
           Some(ColorMapFunctionType::LinearLog), //Some(ColorMapFunctionType::LinearSqrt)
-          Path::new("test/resources/skymap/mom.png"),
+          "test/resources/skymap/mom.png",
           false,
         )
         .unwrap();
@@ -325,7 +323,7 @@ mod tests {
             .collect::<Vec<(u64, f64)>>(),
         };
 
-        to_mom_png_file::<'_, _, Mol>(
+        to_mom_png_file::<'_, _, Mol, _>(
           &mom,
           (1600, 800),
           None,
@@ -334,7 +332,7 @@ mod tests {
           Some(PosConversion::EqMap2GalImg),
           None,
           Some(ColorMapFunctionType::LinearLog), //Some(ColorMapFunctionType::LinearSqrt)
-          Path::new("test/resources/skymap/mom.png"),
+          "test/resources/skymap/mom.png",
           false,
         )
         .unwrap();
diff --git a/src/nested/map/mom/mod.rs b/src/nested/map/mom/mod.rs
index c57e7f3..9f5f7fb 100644
--- a/src/nested/map/mom/mod.rs
+++ b/src/nested/map/mom/mod.rs
@@ -75,8 +75,7 @@ pub trait ZUniqHashT:
   fn depth_from_zuniq(zuniq: Self) -> u8 {
     let n_trailing_zero = zuniq.trailing_zeros() as u8;
     let delta_depth = Self::div_by_dim(n_trailing_zero);
-    let depth = Self::MAX_DEPTH - delta_depth;
-    depth
+    Self::MAX_DEPTH - delta_depth
   }
 
   /// Transforms a `depth` and `hash value` tuple into a `zuniq`.