diff --git a/stellarphot/notebooks/photometry/05-relative-flux-calculation-template.ipynb b/stellarphot/notebooks/photometry/05-relative-flux-calculation-template.ipynb
index 1bf7adde..dc596b15 100644
--- a/stellarphot/notebooks/photometry/05-relative-flux-calculation-template.ipynb
+++ b/stellarphot/notebooks/photometry/05-relative-flux-calculation-template.ipynb
@@ -19,9 +19,9 @@
     "\n",
     "import numpy as np\n",
     "\n",
-    "from stellarphot.differential_photometry.aij_rel_fluxes import calc_aij_relative_flux\n",
+    "from stellarphot.differential_photometry.aij_rel_fluxes import add_relative_flux_column\n",
     "from stellarphot.settings.fits_opener import FitsOpener\n",
-    "from stellarphot import PhotometryData, SourceListData"
+    "from stellarphot.settings.custom_widgets import Spinner"
    ]
   },
   {
@@ -42,7 +42,28 @@
     "fits_openr = FitsOpener(title=\"Select your photometry file\", filter_pattern=[\"*.csv\", \"*.ecsv\"])\n",
     "fits_openr2 = FitsOpener(\n",
     "    title=\"Select your aperture file\", filter_pattern=[\"*.csv\", \"*.fits\", \"*.ecsv\"]\n",
-    ")"
+    ")\n",
+    "go = ipw.Button(description=\"Add flux column\", disabled=True)\n",
+    "prog_box = ipw.HBox()\n",
+    "progress_output = ipw.Output()\n",
+    "spinner = Spinner()\n",
+    "prog_box.children = [spinner, progress_output]\n",
+    "\n",
+    "def on_click(button):\n",
+    "    aperture_file = fits_openr2.path\n",
+    "    photometry_file = fits_openr.path\n",
+    "    spinner.start()\n",
+    "    with progress_output:\n",
+    "        add_relative_flux_column(photometry_file, aperture_file, verbose=True)\n",
+    "    spinner.stop()\n",
+    "\n",
+    "def enable_go(change):\n",
+    "    if fits_openr.file_chooser.selected_filename and fits_openr2.file_chooser.selected_filename:\n",
+    "        go.disabled = False\n",
+    "\n",
+    "fits_openr.file_chooser.observe(enable_go, names=\"_value\")\n",
+    "fits_openr2.file_chooser.observe(enable_go, names=\"_value\")\n",
+    "go.on_click(on_click)"
    ]
   },
   {
@@ -54,121 +75,9 @@
    "outputs": [],
    "source": [
     "box = ipw.VBox()\n",
-    "box.children = [fits_openr.file_chooser, fits_openr2.file_chooser]\n",
+    "box.children = [fits_openr.file_chooser, fits_openr2.file_chooser, go, prog_box]\n",
     "box"
    ]
-  },
-  {
-   "cell_type": "markdown",
-   "metadata": {},
-   "source": [
-    "### Run the remaining cells"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "metadata": {
-    "tags": []
-   },
-   "outputs": [],
-   "source": [
-    "aperture_file = fits_openr2.path\n",
-    "photometry_file = fits_openr.path\n",
-    "\n",
-    "output_file = photometry_file.stem + \"-relative-flux\" + photometry_file.suffix"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "metadata": {
-    "tags": []
-   },
-   "outputs": [],
-   "source": [
-    "photometry = PhotometryData.read(photometry_file)"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "metadata": {
-    "tags": []
-   },
-   "outputs": [],
-   "source": [
-    "comp_table = SourceListData.read(aperture_file)"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "metadata": {
-    "tags": []
-   },
-   "outputs": [],
-   "source": [
-    "comp_table[\"coord\"] = SkyCoord(\n",
-    "    ra=comp_table[\"ra\"], dec=comp_table[\"dec\"], frame=\"icrs\"\n",
-    ")\n",
-    "comp_bool = comp_table[\"marker name\"] == [\"APASS comparison\"]\n",
-    "only_comp_stars = comp_table[comp_bool]\n",
-    "coords = only_comp_stars[\"coord\"]"
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "metadata": {},
-   "source": [
-    "### Calculate flux"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "metadata": {
-    "tags": []
-   },
-   "outputs": [],
-   "source": [
-    "# calculate flux\n",
-    "flux_table = calc_aij_relative_flux(photometry, only_comp_stars)"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
-   "source": [
-    "if \"bjd\" not in flux_table.colnames:\n",
-    "    flux_group = flux_table.group_by(\"file\")\n",
-    "    # Add dummy BJD column so the whole table has one\n",
-    "    flux[\"bjd\"] = np.nan\n",
-    "    for group in flux_group.groups:\n",
-    "        mean_ra = group[\"ra\"].mean()\n",
-    "        mean_dec = group[\"dec\"].mean()\n",
-    "        group.add_bjd_col(bjd_coordinates=SkyCoord(mean_ra, mean_dec))"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "metadata": {
-    "tags": []
-   },
-   "outputs": [],
-   "source": [
-    "flux_table.write(output_file, overwrite=True)"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
-   "source": []
   }
  ],
  "metadata": {
@@ -187,7 +96,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.11.9"
+   "version": "3.11.8"
   }
  },
  "nbformat": 4,