edge blocks masking fix

src/ich/args_in.py

@@ -204,7 +204,8 @@ def rvog_inverse(args):
             ht_ = unblockshaped(np.array(ht_), rows,cols)
             count = unblockshaped(np.array(count), rows,cols)            
             temp_cor = unblockshaped(temp_cor, rows,cols)
-
+            
+            temp_mask[temp_mask==0]=np.nan
             s = s*temp_mask
             c = c*temp_mask