diff --git a/smmregrid/cdo_weights.py b/smmregrid/cdo_weights.py
index f7605dc..4c95cef 100644
--- a/smmregrid/cdo_weights.py
+++ b/smmregrid/cdo_weights.py
@@ -99,7 +99,7 @@ def cdo_generate_weights(source_grid, target_grid, method="con", extrapolate=Tru
             processes = []
             for lev in block:
                 loggy.info("Generating level: %s", str(lev))
-                cdo_extra_vertical = [f"-sellevidx,{lev+1}"]
+                cdo_extra_vertical = [f"-sellevidx,{lev + 1}"]
                 ppp = Process(target=worker,
                               args=(wlist, lev, source_grid, target_grid),
                               kwargs={
diff --git a/smmregrid/gridtype.py b/smmregrid/gridtype.py
index 9083b4d..8e7868a 100644
--- a/smmregrid/gridtype.py
+++ b/smmregrid/gridtype.py
@@ -3,9 +3,9 @@
 
 # default spatial dimensions and vertical coordinates
 DEFAULT_DIMS = {
-    'horizontal':  ['i', 'j', 'x', 'y', 'lon', 'lat', 'longitude', 'latitude',
-                    'cell', 'cells', 'ncells', 'values', 'value', 'nod2', 'pix', 'elem',
-                    'nav_lon', 'nav_lat'],
+    'horizontal': ['i', 'j', 'x', 'y', 'lon', 'lat', 'longitude', 'latitude',
+                   'cell', 'cells', 'ncells', 'values', 'value', 'nod2', 'pix', 'elem',
+                   'nav_lon', 'nav_lat'],
     'vertical': ['lev', 'nz1', 'nz', 'depth', 'depth_full', 'depth_half'],
     'time': ['time']
 }