diff --git a/swash/processing/post.py b/swash/processing/post.py
index ad60c73..9e64f8d 100644
--- a/swash/processing/post.py
+++ b/swash/processing/post.py
@@ -111,15 +111,16 @@ ax_fft.plot(
     alpha=0.2,
     label="PSD ($\\eta$, cas 1)",
 )
-ax_fft.plot(
-    *sgl.welch(eta_, 1 / dt, nperseg=nperseg),
-    lw=1,
-    c="k",
-    alpha=0.2,
-    label="PSD ($\\eta$, cas 2)",
-)
 ax_r.plot(phi_eta[0], R, marker="+", label="R (cas 1)")
-ax_r.plot(phi_eta[0], R_, marker="+", label="R (cas 2)")
+if config.has_option("post", "compare"):
+    ax_fft.plot(
+        *sgl.welch(eta_, 1 / dt, nperseg=nperseg),
+        lw=1,
+        c="k",
+        alpha=0.2,
+        label="PSD ($\\eta$, cas 2)",
+    )
+    ax_r.plot(phi_eta[0], R_, marker="+", label="R (cas 2)")
 ax_r.set(xlim=(0, 0.3), ylim=(0, 1), xlabel="f (Hz)", ylabel="R")
 ax_fft.set(ylim=0, ylabel="PSD (m²/Hz)")
 ax_r.grid()
@@ -129,16 +130,17 @@ fig_r.tight_layout()
 
 fig_x, ax_x = plt.subplots(figsize=(10, 1))
 ax_x.plot(data["x"], -data["botl"], color="k")
-ax_x.plot(data["x"], -data_comp["botl"], color="k", ls="-.")
 ax_x.plot(
     data["x"],
     np.maximum(data["watl"][arg_t0, :], -data["botl"]),
 )
-ax_x.plot(
-    data["x"],
-    np.maximum(data_comp["watl"][arg_t0, :], -data_comp["botl"]),
-    ls="-.",
-)
+if config.has_option("post", "compare"):
+    ax_x.plot(data["x"], -data_comp["botl"], color="k", ls="-.")
+    ax_x.plot(
+        data["x"],
+        np.maximum(data_comp["watl"][arg_t0, :], -data_comp["botl"]),
+        ls="-.",
+    )
 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)