diff --git a/swash/processing/post.py b/swash/processing/post.py
index 2642226..0376bf8 100644
--- a/swash/processing/post.py
+++ b/swash/processing/post.py
@@ -82,8 +82,8 @@ ax_r.set(ylim=(0, 1), xlabel="f (Hz)", ylabel="R")
 ax_r.grid()
 
 fig_x, ax_x = plt.subplots()
-ax_x.plot(bathy.index, botl[0, :], color='k')
-ax_x.plot(bathy.index, (dep-botl)[t == t0, :].T)
+ax_x.plot(-botl[0, :], color='k')
+ax_x.plot((dep-botl)[t == t0, :].T)
 ax_x.axvline(x0)
 ax_x.set(xlabel="x (m)", ylabel="z (m)")
 ax_x.autoscale(axis="x", tight=True)