diff --git a/swash/processing/post.py b/swash/processing/post.py
index 5194ca5..f3ed9e9 100644
--- a/swash/processing/post.py
+++ b/swash/processing/post.py
@@ -36,7 +36,7 @@ dt = config.getfloat("post", "dt")
 f = 1 / dt
 log.info(f"Computing reflection coefficient at x={x0}")
 
-eta = data["dep"][t > t0, x0] - data["botl"][x0]
+eta = data["watl"][t > t0, x0]
 u = data["vel"][t > t0, 0, x0]
 
 phi_eta = np.abs(sgl.csd(eta, eta, f))
@@ -50,13 +50,13 @@ R = np.sqrt(
 
 # Plotting
 log.info("Plotting results")
-fig, (ax_dep, ax_vel) = plt.subplots(2)
+fig, (ax_watl, ax_vel) = plt.subplots(2)
 
-ax_dep.plot(t, data["dep"][:, x0] - data["botl"][x0], label="dep")
-ax_dep.set(xlabel="t (s)", ylabel="z (m)")
-ax_dep.autoscale(axis="x", tight=True)
-ax_dep.grid()
-ax_dep.axvline(t0, c="k", alpha=0.2)
+ax_watl.plot(t, data["watl"][:, x0], label="watl")
+ax_watl.set(xlabel="t (s)", ylabel="z (m)")
+ax_watl.autoscale(axis="x", tight=True)
+ax_watl.grid()
+ax_watl.axvline(t0, c="k", alpha=0.2)
 
 ax_vel.plot(t, data["vel"][:, 0, x0], label="vel")
 ax_vel.set(xlabel="t (s)", ylabel="U (m/s)")
@@ -75,7 +75,7 @@ ax_r.grid()
 
 fig_x, ax_x = plt.subplots()
 ax_x.plot(-data["botl"], color="k")
-ax_x.plot(data["dep"][np.argmin(np.abs(t - t0)), :] - data["botl"])
+ax_x.plot(data["watl"][np.argmin(np.abs(t - t0)), :])
 ax_x.axvline(x0, c="k", alpha=0.2)
 ax_x.set(xlabel="x (m)", ylabel="z (m)")
 ax_x.autoscale(axis="x", tight=True)