diff --git a/notebooks/Gotthard2/Correction_Gotthard2_NBC.ipynb b/notebooks/Gotthard2/Correction_Gotthard2_NBC.ipynb
index 13ea96c35296ca55fe10524bc3bffca4475715b6..902be1ccd9e61ad52b1ea988a00c333dc916502c 100644
--- a/notebooks/Gotthard2/Correction_Gotthard2_NBC.ipynb
+++ b/notebooks/Gotthard2/Correction_Gotthard2_NBC.ipynb
@@ -480,9 +480,9 @@
     "            gain = np.flip(gain, axis=-1)\n",
     "\n",
     "        if gh2_detector == \"25um\":\n",
-    "            data_stored[..., i::2] = data_corr.copy()\n",
-    "            gain_stored[..., i::2] = gain.copy()\n",
-    "            mask_stored[..., i::2] = mask.copy()\n",
+    "            data_stored[..., i::2] = data_corr\n",
+    "            gain_stored[..., i::2] = gain\n",
+    "            mask_stored[..., i::2] = mask\n",
     "        else:  # \"50um\"\n",
     "            data_stored = data_corr\n",
     "            gain_stored = gain\n",