diff --git a/3.3.4-semiconductor-hall-effect/processing.ipynb b/3.3.4-semiconductor-hall-effect/processing.ipynb
index 63dd813..ceff67f 100644
--- a/3.3.4-semiconductor-hall-effect/processing.ipynb
+++ b/3.3.4-semiconductor-hall-effect/processing.ipynb
@@ -2,53 +2,35 @@
  "cells": [
   {
    "cell_type": "code",
-   "execution_count": 21,
-   "id": "1dd847b1-0ad5-4f0f-b22b-8c68142dcbe3",
+   "execution_count": 23,
+   "id": "f1de9529-db33-4104-8a94-407330ffcb99",
    "metadata": {
     "tags": []
    },
    "outputs": [],
    "source": [
+    "# %load ../processing_tools.py\n",
     "import numpy as np\n",
+    "from scipy.optimize import curve_fit\n",
     "import pandas as pd\n",
+    "\n",
     "import matplotlib.pyplot as plt\n",
     "import matplotlib\n",
-    "from scipy.optimize import curve_fit\n",
-    "import scienceplots"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": 30,
-   "id": "c499f225-0b38-454e-91da-78b3137de096",
-   "metadata": {
-    "tags": []
-   },
-   "outputs": [],
-   "source": [
-    "plt.style.use(['science', 'russian-font'])"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": 31,
-   "id": "2cc1eb6c-97ea-41d0-b13e-2fda76a2af76",
-   "metadata": {
-    "tags": []
-   },
-   "outputs": [],
-   "source": [
+    "import scienceplots\n",
+    "\n",
+    "plt.style.use(['science', 'russian-font'])\n",
+    "\n",
     "matplotlib.rcParams.update({\n",
     "    'figure.figsize': [6, 4],\n",
     "    'savefig.facecolor': 'white',\n",
     "    'figure.dpi': 150.0,\n",
     "    'font.size': 12.0,\n",
-    "})"
+    "})\n"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": 32,
+   "execution_count": 24,
    "id": "657cc2c7-920b-46e0-a7a8-ef65146ddf4e",
    "metadata": {
     "tags": []
@@ -61,7 +43,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 33,
+   "execution_count": 25,
    "id": "61022dfd-06b7-43cb-ac1f-2128f46ff7ee",
    "metadata": {
     "tags": []
@@ -83,7 +65,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 34,
+   "execution_count": 26,
    "id": "4c853de8-c61e-4ce0-b796-ffaa6e697b12",
    "metadata": {
     "tags": []
@@ -98,7 +80,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 35,
+   "execution_count": 27,
    "id": "576974ec-5d4d-42c1-9280-7a7f9b74a6be",
    "metadata": {
     "tags": []
@@ -138,7 +120,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 36,
+   "execution_count": 28,
    "id": "fadcfd44-216a-4449-9e75-398c8d3c740c",
    "metadata": {
     "tags": []
@@ -157,7 +139,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 37,
+   "execution_count": 29,
    "id": "e6741806-03fb-487f-8366-bbb6c825c49b",
    "metadata": {
     "tags": []
@@ -170,7 +152,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 47,
+   "execution_count": 30,
    "id": "08c7f31f-1c40-4904-b619-91c227f7a6b3",
    "metadata": {
     "tags": []
@@ -228,7 +210,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 49,
+   "execution_count": 31,
    "id": "0d76d070-47ce-4f4f-9342-566a1107abab",
    "metadata": {
     "tags": []
@@ -263,7 +245,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 40,
+   "execution_count": 32,
    "id": "2d140d8b-b9fb-48b7-88fd-ccd862fc794f",
    "metadata": {
     "tags": []
@@ -275,7 +257,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 41,
+   "execution_count": 33,
    "id": "deb90002-f303-4b6b-ad90-e3c83d3ab41b",
    "metadata": {
     "tags": []
@@ -287,7 +269,7 @@
        "0.0004318927697950297"
       ]
      },
-     "execution_count": 41,
+     "execution_count": 33,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -299,7 +281,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 42,
+   "execution_count": 34,
    "id": "8731ed11-0b5c-4304-9ab3-eb563dbe33e3",
    "metadata": {
     "tags": []
@@ -311,7 +293,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 43,
+   "execution_count": 35,
    "id": "048587bd-6a59-449c-a65c-86f810f3ce4c",
    "metadata": {
     "tags": []
@@ -323,7 +305,7 @@
        "1.44711846020626e+22"
       ]
      },
-     "execution_count": 43,
+     "execution_count": 35,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -335,7 +317,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 44,
+   "execution_count": 36,
    "id": "8f61c6e8-356b-4a4c-b797-dd5e8d0331eb",
    "metadata": {
     "tags": []
@@ -349,7 +331,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 45,
+   "execution_count": 37,
    "id": "1f153f00-d44c-41e5-8bab-ad09bd8e5896",
    "metadata": {
     "tags": []
@@ -361,7 +343,7 @@
        "274.0977615349475"
       ]
      },
-     "execution_count": 45,
+     "execution_count": 37,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -373,7 +355,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 46,
+   "execution_count": 38,
    "id": "cf5b7366-16f9-434f-969f-74b61fed23ca",
    "metadata": {
     "tags": []
@@ -385,7 +367,7 @@
        "1183.8084142394603"
       ]
      },
-     "execution_count": 46,
+     "execution_count": 38,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -394,14 +376,6 @@
     "b = sigma * R_h\n",
     "b*10000"
    ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "id": "50cff85d-2697-426f-a535-7adfc552ef53",
-   "metadata": {},
-   "outputs": [],
-   "source": []
   }
  ],
  "metadata": {