diff --git a/swash/processing/post.py b/swash/processing/post.py
index 6ad9a62..4276f2d 100644
--- a/swash/processing/post.py
+++ b/swash/processing/post.py
@@ -21,6 +21,6 @@ botl = read_nohead_scalar(root.joinpath("botl.dat"), n)
 dep = read_nohead_scalar(root.joinpath("dep.dat"), n)
 watl = read_nohead_scalar(root.joinpath("watl.dat"), n)
 
-plt.plot(dep.T-botl.T, label="dep")
+plt.plot(dep.T - botl.T, label="dep")
 plt.plot(-botl.T[:, 0], label="botl")
 plt.show(block=True)