adding one sentence to NIRISS_correct_pure_parallel_WCS.ipynb

notebooks/cross_instrument/update_pure_parallel_wcs/NIRISS_correct_pure_parallel_WCS.ipynb

@@ -7,7 +7,7 @@
    "source": [
     "# Notebook to Improve Accuracy of World Coordinate System of Pure Parallel Dataset\n",
     "\n",
-    "## 1. Introduction\n",
+    "## Introduction\n",
     "\n",
     "In this notebook, we will go through the steps needed to improve the accuracy of the World Coordinate System (WCS) in the headers of pure parallel datasets that were observed with JWST prior to the installation of DMS 10.2 (April 2024). The example dataset is jw01571078001_03201_00001_nis_rate.fits, which is a direct image from pure parallel Program ID 1571 (PI: Malkan). Note that the `update_parallel_wcs.py` script has to be run on all individual datasets taken during a pure parallel visit in order to get the improved WCS for that visit. \n",
     "\n",
@@ -23,6 +23,8 @@
     "pip install -r requirements.txt\n",
     "```\n",
     "\n",
+    "Date last published: September 3, 2024\n",
+    "\n",
     "### Imports"
    ]
   },