diff --git a/demo_spectrogram.ipynb b/demo_spectrogram.ipynb
index 86897e9..19d7d9a 100644
--- a/demo_spectrogram.ipynb
+++ b/demo_spectrogram.ipynb
@@ -11,7 +11,7 @@
},
{
"cell_type": "code",
- "execution_count": null,
+ "execution_count": 1,
"id": "3d488d70",
"metadata": {
"pycharm": {
@@ -46,10 +46,38 @@
},
{
"cell_type": "code",
- "execution_count": null,
+ "execution_count": 2,
"id": "0d503155",
"metadata": {},
- "outputs": [],
+ "outputs": [
+ {
+ "data": {
+ "text/html": [
+ "\n",
+ " \n",
+ " "
+ ],
+ "text/plain": [
+ ""
+ ]
+ },
+ "metadata": {},
+ "output_type": "display_data"
+ },
+ {
+ "data": {
+ "image/png": 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\n",
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