diff --git a/tutorials/simulating_sequences.ipynb b/tutorials/simulating_sequences.ipynb
index 3c942b5ea..fd9565119 100644
--- a/tutorials/simulating_sequences.ipynb
+++ b/tutorials/simulating_sequences.ipynb
@@ -51,7 +51,7 @@
     "R_interatomic = pulser.MockDevice.rydberg_blockade_radius(U)\n",
     "coords = (\n",
     "    R_interatomic\n",
-    "    / (2 * np.tan(np.pi / L))\n",
+    "    / (2 * np.sin(np.pi / L))\n",
     "    * np.array(\n",
     "        [\n",
     "            (np.cos(theta * 2 * np.pi / L), np.sin(theta * 2 * np.pi / L))\n",