From 027052142745a723ffdb1cc7a01ff91b2ff5e270 Mon Sep 17 00:00:00 2001
From: jrob93 <james.robinson@ed.ac.uk>
Date: Wed, 14 Oct 2026 10:26:16 +0000
Subject: [PATCH] save to fits

---
 .../202_Images/202_1_Deep_coadds.ipynb        | 40 ++++++++++++++++++-
 1 file changed, 38 insertions(+), 2 deletions(-)

diff --git a/DP2/200_Data_products/202_Images/202_1_Deep_coadds.ipynb b/DP2/200_Data_products/202_Images/202_1_Deep_coadds.ipynb
index c4d7e54a..fa41bbf8 100644
--- a/DP2/200_Data_products/202_Images/202_1_Deep_coadds.ipynb
+++ b/DP2/200_Data_products/202_Images/202_1_Deep_coadds.ipynb
@@ -1826,16 +1826,52 @@
    "outputs": [],
    "source": [
     "del ref, dataId, use_tract, use_patch, use_columns, objects, tx\n",
-    "del dataset_refs, deep_coadd"
+    "del dataset_refs"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "id": "c06ebdd7-482a-43a6-aed8-4ed053c8d184",
+   "metadata": {},
+   "source": [
+    "## 6. Save `deep_coadd` to file\n",
+    "`deep_coadd` is a `CellCoadd` object type and has an associated method to write the object to file, as described in the [API](https://images.lsst.io/api/lsst.images.cells.CellCoadd.html#lsst.images.cells.CellCoadd.write). Uncomment the following cell to save `deep_coadd` as a FITS file."
    ]
   },
   {
    "cell_type": "code",
    "execution_count": null,
+   "id": "255b693c-4767-4152-addf-1d98a7276783",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "# deep_coadd.image.write(\n",
+    "#     \"deep_coadd_{}_{}_{}_{}.fits\".format(\n",
+    "#         deep_coadd.skymap,\n",
+    "#         deep_coadd.tract,\n",
+    "#         deep_coadd.patch.id,\n",
+    "#         deep_coadd.band\n",
+    "#     )\n",
+    "# )"
+   ]
+  },
+  {
+   "cell_type": "markdown",
    "id": "8270ac15-73ee-4e87-ab72-f0a12b3c455f",
    "metadata": {},
+   "source": [
+    "Clean up."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "7cf73981-189c-401d-bde8-e6e8fc26b31e",
+   "metadata": {},
    "outputs": [],
-   "source": []
+   "source": [
+    "del deep_coadd"
+   ]
   }
  ],
  "metadata": {