spring 2025 update

Lab_4/Lab_4.ipynb

@@ -4,14 +4,14 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "# <p style=\"text-align: center;\">PHYS 134L Spring 2024 Lab 4</p>"
+    "# <p style=\"text-align: center;\">PHYS 134L Spring 2025 Lab 4</p>"
    ]
   },
   {
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "<div class=\"alert alert-block alert-danger\"><b>Due date:</b> Sunday, May 5th, 2024 by 11:59pm, submitted through Gradescope.</div>"
+    "<div class=\"alert alert-block alert-danger\"><b>Due date:</b> Sunday, May 4th, 2024 by 11:59pm, submitted through Gradescope.</div>"
    ]
   },
   {
@@ -205,7 +205,7 @@
     "\n",
     "See the ```photutils``` documentation [here](https://photutils.readthedocs.io/en/stable/aperture.html) on aperture photometry. **Read up on the documentation and try it out yourself.**\n",
     "\n",
-    "To get started quickly you can ignore some of these sections in the documentation: sky apertures, pixel masking, aperture masks, aperture photometry using Sky Coordinates. \n",
+    "To get started quickly you can ignore some of these sections in the documentation: pixel masking, aperture masks, aperture photometry using Sky Coordinates. \n",
     "\n",
     "**Extract photometry using circular apertures for all the sources you found using the DAOStarFinder. Don't forget to subtract off the background (using whatever method you settled on earlier) before calculating the photometry. What do you think the radius of your circular apertures should be and why?**"
    ]