diff --git a/book/week_15/session/intro.ipynb b/book/week_15/session/intro.ipynb
index 81ad694..4c95277 100644
--- a/book/week_15/session/intro.ipynb
+++ b/book/week_15/session/intro.ipynb
@@ -232,7 +232,7 @@
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-       "     <use xlink:href=\"#m59d3a4e677\" x=\"262.66752\" y=\"150.854437\" style=\"fill: #9467bd; stroke: #9467bd\"/>\n",
+       "    <g clip-path=\"url(#p44ef84e8fe)\">\n",
+       "     <use xlink:href=\"#mda9a74e9c1\" x=\"262.66752\" y=\"150.854437\" style=\"fill: #9467bd; stroke: #9467bd\"/>\n",
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-       "\" clip-path=\"url(#pabe5ee446c)\" style=\"fill: none; stroke: #8c564b; stroke-width: 1.5; stroke-linecap: square\"/>\n",
+       "\" clip-path=\"url(#p44ef84e8fe)\" style=\"fill: none; stroke: #8c564b; stroke-width: 1.5; stroke-linecap: square\"/>\n",
        "    <defs>\n",
-       "     <path id=\"m9cd8037b4a\" d=\"M 0 3 \n",
+       "     <path id=\"mcce787e141\" d=\"M 0 3 \n",
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        "    </defs>\n",
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-       "\" clip-path=\"url(#pabe5ee446c)\" style=\"fill: none; stroke: #000000; stroke-width: 1.5; stroke-linecap: square\"/>\n",
+       "\" clip-path=\"url(#p44ef84e8fe)\" style=\"fill: none; stroke: #000000; stroke-width: 1.5; stroke-linecap: square\"/>\n",
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        "   <g id=\"line2d_36\">\n",
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-       "\" clip-path=\"url(#pabe5ee446c)\" style=\"fill: none; stroke: #000000; stroke-width: 1.5; stroke-linecap: square\"/>\n",
+       "\" clip-path=\"url(#p44ef84e8fe)\" style=\"fill: none; stroke: #000000; stroke-width: 1.5; stroke-linecap: square\"/>\n",
        "   </g>\n",
        "   <g id=\"line2d_37\">\n",
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-       "\" clip-path=\"url(#pabe5ee446c)\" style=\"fill: none; stroke: #000000; stroke-width: 1.5; stroke-linecap: square\"/>\n",
+       "\" clip-path=\"url(#p44ef84e8fe)\" style=\"fill: none; stroke: #000000; stroke-width: 1.5; stroke-linecap: square\"/>\n",
        "    <defs>\n",
-       "     <path id=\"ma361abc1eb\" d=\"M 0 3 \n",
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-       "     <use xlink:href=\"#ma361abc1eb\" x=\"214.00704\" y=\"53.533477\" style=\"stroke: #000000\"/>\n",
+       "\" clip-path=\"url(#p44ef84e8fe)\" style=\"fill: none; stroke: #000000; stroke-width: 1.5; stroke-linecap: square\"/>\n",
+       "    <g clip-path=\"url(#p44ef84e8fe)\">\n",
+       "     <use xlink:href=\"#m63e77d7753\" x=\"214.00704\" y=\"53.533477\" style=\"stroke: #000000\"/>\n",
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        "   </g>\n",
        "   <g id=\"line2d_39\">\n",
        "    <path d=\"M 214.00704 53.533477 \n",
        "L 238.33728 77.863717 \n",
-       "\" clip-path=\"url(#pabe5ee446c)\" style=\"fill: none; stroke: #000000; stroke-width: 1.5; stroke-linecap: square\"/>\n",
+       "\" clip-path=\"url(#p44ef84e8fe)\" style=\"fill: none; stroke: #000000; stroke-width: 1.5; stroke-linecap: square\"/>\n",
        "   </g>\n",
        "   <g id=\"patch_4\">\n",
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@@ -1099,7 +1099,7 @@
        "  </g>\n",
        " </g>\n",
        " <defs>\n",
-       "  <clipPath id=\"pabe5ee446c\">\n",
+       "  <clipPath id=\"p44ef84e8fe\">\n",
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        "  </clipPath>\n",
        " </defs>\n",
@@ -1121,7 +1121,7 @@
     "%config InlineBackend.figure_formats = ['svg']\n",
     "\n",
     "t, F, T, L, d = sym.symbols('t F T L d')\t\n",
-    " \n",
+    "\n",
     "d = sym.nsimplify(0.25) / sym.sqrt(sym.pi)\n",
     "t = sym.nsimplify(0.010)\n",
     "F = 4000\n",
@@ -1179,7 +1179,10 @@
     "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')\n",
-    "plt.gcf().patch.set_alpha(0);"
+    "plt.gcf().patch.set_alpha(0)\n",
+    "\n",
+    "# Save the figure with transparent background\n",
+    "plt.savefig('plot.svg', format='svg', transparent=True);"
    ]
   },
   {
diff --git a/book/week_15/session/intro_data/mohr.svg b/book/week_15/session/intro_data/mohr.svg
index 6b69423..f4cfff9 100644
--- a/book/week_15/session/intro_data/mohr.svg
+++ b/book/week_15/session/intro_data/mohr.svg
@@ -1,12 +1,12 @@
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-    <dc:date>2024-12-10T18:11:14.631984</dc:date>
+    <dc:date>2024-12-10T18:14:56.417241</dc:date>
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