diff --git a/doc/examples/4_gravimetry_magnetics/plot_05_inv-gravity-3d.py b/doc/examples/4_gravimetry_magnetics/plot_05_inv-gravity-3d.py
index 3a9f74396..39d0dc721 100644
--- a/doc/examples/4_gravimetry_magnetics/plot_05_inv-gravity-3d.py
+++ b/doc/examples/4_gravimetry_magnetics/plot_05_inv-gravity-3d.py
@@ -41,7 +41,7 @@
 
 v = np.zeros((len(z)-1, len(y)-1, len(x)-1))
 for i in range(7):
-    v[1+i, 11-i:16-i, 7:13] = 1000 # 1g/cm³
+    v[1+i, 11-i:16-i, 7:13] = 1 # 1g/cm³
 
 grid["synth"] = v.ravel()