diff --git a/ldcpy/calcs.py b/ldcpy/calcs.py
index d83d29d..fc4347c 100644
--- a/ldcpy/calcs.py
+++ b/ldcpy/calcs.py
@@ -7,6 +7,7 @@
 from math import exp, pi, sqrt
 from typing import Optional
 
+
 import cf_xarray as cf
 import dask
 import matplotlib as mpl