update preamble of advanced ifu_optimal notebook

notebooks/ifu_optimal/ifu_optimal.ipynb

@@ -4,7 +4,22 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "# Advanced: NIRSpec IFU Optimal Point Source Extraction"
+    "# NIRSpec IFU Optimal Point Source Extraction"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "**Use case:** optimal spectral extraction; method by [Horne (1986)](https://ui.adsabs.harvard.edu/abs/1986PASP...98..609H/abstract).\n",
+    "\n",
+    "**Data:** JWST simulated NIRSpec IFU data; point sources.\n",
+    "\n",
+    "**Tools:**  jwst, webbpsf, matplotlib, scipy, custom functions.\n",
+    "\n",
+    "**Cross-intrument:** any spectrograph. \n",
+    "\n",
+    "**Documentation:** This notebook is part of a STScI's larger [post-pipeline Data Analysis Tools Ecosystem](https://jwst-docs.stsci.edu/jwst-post-pipeline-data-analysis)."
    ]
   },
   {
@@ -99,7 +114,10 @@
     "    raise RuntimeError('Error retrieving file: ' + result[1])\n",
     "    \n",
     "# Construct the local filepath \n",
-    "filename = os.path.join(os.path.abspath('.'), uri.rsplit('/', 1)[-1])"
+    "filename = os.path.join(os.path.abspath('.'), uri.rsplit('/', 1)[-1])\n",
+    "\n",
+    "#Optionally Replace MAST data with custom reprocessed data in the current directory\n",
+    "#filename=\"./jw01335-o008_t007_nirspec_g235h-f170lp_s3d.fits\""
    ]
   },
   {
@@ -109,10 +127,6 @@
    "outputs": [],
    "source": [
     "# Open and inspect the file and WCS\n",
-    "# Replace MAST data with custom reprocessed data:\n",
-    "file_dir = \"/Users/pogle/Desktop/NIRSpec/ifu_optimal/q3d_sdss1652_ifu_rerun/extended_source/\"\n",
-    "#filename=\"jw01335-o008_t007_nirspec_g235h-f170lp_s3d.fits\"\n",
-    "#filename= file_dir + 'jw01335-o008_t007_nirspec_g235h-f170lp_s3d.fits'\n",
     "with fits.open(filename, memmap=False) as hdulist:\n",
     "    sci = hdulist['SCI'].data\n",
     "    err = hdulist['ERR'].data\n",