diff --git a/book/week_15/session/intro.ipynb b/book/week_15/session/intro.ipynb
index e924bc8..81ad694 100644
--- a/book/week_15/session/intro.ipynb
+++ b/book/week_15/session/intro.ipynb
@@ -22,7 +22,7 @@
     ":align: center\n",
     "```\n",
     "\n",
-    "Calculate the displacement of $text{E}$ and the moments in all the members using a force-, displacement- or hybrid- ('hoekveranderingsvergelijkingen' with moveable nodes) method.\n",
+    "Calculate the displacement of $\\text{E}$ and the moments in all the members using a force-, displacement- or hybrid- ('hoekveranderingsvergelijkingen' with moveable nodes) method.\n",
     "\n",
     "````{admonition} Solution\n",
     ":class: tip, dropdown\n",
@@ -232,7 +232,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 11,
+   "execution_count": 1,
    "metadata": {
     "tags": [
      "remove-cell"
@@ -370,7 +370,7 @@
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        "   <cc:Work>\n",
        "    <dc:type rdf:resource=\"http://purl.org/dc/dcmitype/StillImage\"/>\n",
-       "    <dc:date>2024-12-05T16:22:27.343440</dc:date>\n",
+       "    <dc:date>2024-12-10T18:11:14.631984</dc:date>\n",
        "    <dc:format>image/svg+xml</dc:format>\n",
        "    <dc:creator>\n",
        "     <cc:Agent>\n",
@@ -389,8 +389,9 @@
        "L 286.942922 291.110437 \n",
        "L 286.942922 0 \n",
        "L 0 0 \n",
+       "L 0 291.110437 \n",
        "z\n",
-       "\" style=\"fill: #ffffff\"/>\n",
+       "\" style=\"fill: none; opacity: 0\"/>\n",
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        "  <g id=\"axes_1\">\n",
        "   <g id=\"patch_2\">\n",
@@ -413,23 +414,23 @@
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        "z\n",
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-       "\" clip-path=\"url(#p2939ac489d)\" style=\"fill: none; stroke: #9467bd; stroke-width: 1.5; stroke-linecap: square\"/>\n",
+       "\" clip-path=\"url(#pabe5ee446c)\" style=\"fill: none; stroke: #9467bd; stroke-width: 1.5; stroke-linecap: square\"/>\n",
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-       "     <path id=\"m74a17a38d5\" d=\"M 0 3 \n",
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-       "\" clip-path=\"url(#p2939ac489d)\" style=\"fill: none; stroke: #8c564b; stroke-width: 1.5; stroke-linecap: square\"/>\n",
+       "\" clip-path=\"url(#pabe5ee446c)\" style=\"fill: none; stroke: #8c564b; stroke-width: 1.5; stroke-linecap: square\"/>\n",
        "    <defs>\n",
-       "     <path id=\"m6529a08241\" d=\"M 0 3 \n",
+       "     <path id=\"m9cd8037b4a\" d=\"M 0 3 \n",
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-       "\" clip-path=\"url(#p2939ac489d)\" style=\"fill: none; stroke: #000000; stroke-width: 1.5; stroke-linecap: square\"/>\n",
+       "\" clip-path=\"url(#pabe5ee446c)\" style=\"fill: none; stroke: #000000; stroke-width: 1.5; stroke-linecap: square\"/>\n",
        "    <defs>\n",
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-       "\" clip-path=\"url(#p2939ac489d)\" style=\"fill: none; stroke: #000000; stroke-width: 1.5; stroke-linecap: square\"/>\n",
+       "\" clip-path=\"url(#pabe5ee446c)\" style=\"fill: none; stroke: #000000; stroke-width: 1.5; stroke-linecap: square\"/>\n",
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@@ -1098,7 +1099,7 @@
        "  </g>\n",
        " </g>\n",
        " <defs>\n",
-       "  <clipPath id=\"p2939ac489d\">\n",
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        " </defs>\n",
@@ -1108,7 +1109,9 @@
        "<Figure size 640x480 with 1 Axes>"
       ]
      },
-     "metadata": {},
+     "metadata": {
+      "needs_background": "light"
+     },
      "output_type": "display_data"
     }
    ],
@@ -1175,8 +1178,16 @@
     "plt.plot([0,sigma],[-tau,-tau],color='black')\n",
     "plt.plot(sigma,-tau,marker='o',color='black')\n",
     "plt.plot(sigma_xx,-tau_xy,marker='o',color='black')\n",
-    "plt.plot([sigma_xx,sigma],[-tau_xy,-tau],color='black');"
+    "plt.plot([sigma_xx,sigma],[-tau_xy,-tau],color='black')\n",
+    "plt.gcf().patch.set_alpha(0);"
    ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
   }
  ],
  "metadata": {
diff --git a/book/week_15/session/intro_data/mohr.svg b/book/week_15/session/intro_data/mohr.svg
index 5e61bcd..6b69423 100644
--- a/book/week_15/session/intro_data/mohr.svg
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