diff --git a/notebooks/Jungfrau/Jungfrau_Gain_Correct_and_Verify_NBC.ipynb b/notebooks/Jungfrau/Jungfrau_Gain_Correct_and_Verify_NBC.ipynb
index dbd7124e87d1fb57bd8b46d79141bf444555df15..46df0023b0104b3bdf5a00e22bfc11e86a0ec11d 100644
--- a/notebooks/Jungfrau/Jungfrau_Gain_Correct_and_Verify_NBC.ipynb
+++ b/notebooks/Jungfrau/Jungfrau_Gain_Correct_and_Verify_NBC.ipynb
@@ -680,11 +680,10 @@
    },
    "outputs": [],
    "source": [
-    "for pdu, mod in zip(db_modules, karabo_da):\n",
-    "    modno = jf_inp.source_to_modno[instrument_source_template.format(karabo_id, mod)] - 1\n",
+    "for i, (pdu, mod) in enumerate(zip(db_modules, karabo_da)):\n",
     "    h, ex, ey = np.histogram2d(\n",
-    "        raw[modno].flatten(),\n",
-    "        gain[modno].flatten(),\n",
+    "        raw[i].flatten(),\n",
+    "        gain[i].flatten(),\n",
     "        bins=[100, 4],\n",
     "        range=[[0, 10000], [0, 4]],\n",
     "    )\n",
@@ -837,11 +836,10 @@
    },
    "outputs": [],
    "source": [
-    "for pdu, mod in zip(db_modules, karabo_da):\n",
-    "    modno = jf_out.source_to_modno[instrument_source_template.format(karabo_id, mod)] - 1\n",
+    "for i, (pdu, mod) in enumerate(zip(db_modules, karabo_da)):\n",
     "    fig = plt.figure(figsize=(20,10))\n",
     "    ax = fig.add_subplot(211)\n",
-    "    corrected_flatten = corrected[modno].flatten()\n",
+    "    corrected_flatten = corrected[i].flatten()\n",
     "    h = ax.hist(\n",
     "        corrected_flatten,\n",
     "        bins=1000,\n",