diff --git a/code/notebooks/stft.ipynb b/code/notebooks/stft.ipynb
index 2b18b9b..3e661b7 100644
--- a/code/notebooks/stft.ipynb
+++ b/code/notebooks/stft.ipynb
@@ -443,12 +443,13 @@
     "        plt.figure(dpi=300)  # Set figure size and DPI\n",
     "        plt.pcolormesh(data.transpose(), cmap='jet', vmax=0.03, vmin=0.0, rasterized=True)\n",
     "        # plt.title('STFT Preview')\n",
-    "        plt.colorbar(label='Magnitude ($m/s^2$)')\n",
+    "        plt.colorbar(label='Magnitude (m/s²)')\n",
     "        plt.xlabel('Segmen Waktu')\n",
     "        plt.ylabel('Sampel Frekuensi (Hz)')\n",
     "        plt.xticks(np.linspace(0, len(data)-1, x_num_ticks))  # Set x-ticks at regular intervals\n",
     "        plt.yticks(np.linspace(0, len(data.columns)-1, y_num_ticks))  # Set y-ticks at regular intervals\n",
-    "        mpl.rcParams['svg.fonttype'] = None\n",
+    "        plt.rcParams['svg.fonttype'] = 'none'\n",
+    "        plt.rcParams['text.usetex'] = False     # use mathtext, not external LaTeX\n",
     "        plt.savefig(\"output_single.svg\", format=\"svg\", dpi=100)\n",
     "        plt.show()\n",
     "\n",
@@ -462,14 +463,14 @@
     "        # Loop through each subplot and plot the data\n",
     "        for i in range(len(data)):\n",
     "            pcm = axes[i].pcolormesh(data[i].transpose(), cmap='jet', vmax=0.03, vmin=0.0, rasterized=True)\n",
-    "            axes[i].set_title(f'd_{i+1}', fontsize=12)\n",
+    "            axes[i].set_title(f'd{i+1}', fontsize=12)\n",
     "            axes[i].set_xticks(np.linspace(0, len(data[i])-1, 6))  # Set x-ticks at regular intervals\n",
     "            axes[i].set_yticks(np.linspace(0, len(data[i].columns)-1, 9))  # Set y-ticks at regular intervals\n",
     "\n",
     "        # Add a single color bar for all subplots\n",
     "        # Use the first `pcolormesh` object (or any valid one) for the color bar\n",
     "        cbar = fig.colorbar(pcm, ax=axes, orientation='vertical')\n",
-    "        cbar.set_label('Magnitude ($m/s^2$)', fontsize=12)\n",
+    "        cbar.set_label('Magnitude (m/s²)', fontsize=12)\n",
     "\n",
     "        # Set shared labels\n",
     "        fig.text(0.5, 0.04, 'Segmen Waktu', ha='center', fontsize=12)\n",
@@ -479,7 +480,9 @@
     "        # Adjust layout\n",
     "        # plt.tight_layout(rect=[0.05, 0.05, 1, 1])  # Leave space for shared labels\n",
     "        plt.subplots_adjust(left=0.1, right=0.75, top=0.9, bottom=0.1, wspace=0.2, hspace=0.2)\n",
-    "        mpl.rcParams['svg.fonttype'] = None\n",
+    "        plt.rcParams['svg.fonttype'] = 'none'\n",
+    "        plt.rcParams['text.usetex'] = False     # use mathtext, not external LaTeX\n",
+    "        mpl.rcParams['text.usetex'] = False     # use mathtext, not external LaTeX\n",
     "        plt.savefig(\"output_multiple.svg\", format=\"svg\", dpi=80)\n",
     "        plt.show()"
    ]