diff --git a/docs/source/data-proc-additional.ipynb b/docs/source/data-proc-additional.ipynb
index ffd9725fe..a9b6802a1 100644
--- a/docs/source/data-proc-additional.ipynb
+++ b/docs/source/data-proc-additional.ipynb
@@ -115,7 +115,7 @@
       "source": [
         "The sketch below shows the relationship between the above vertical coordinate (_z_-axis) variables.\n",
         "\n",
-        "![z_axis_vars](./images/z_axis_vars.png)"
+        "![z_axis_vars](./images/z_axis_vars_v2.png)"
       ]
     },
     {
diff --git a/docs/source/images/z_axis_vars.png b/docs/source/images/z_axis_vars.png
deleted file mode 100644
index c1af88182..000000000
Binary files a/docs/source/images/z_axis_vars.png and /dev/null differ
diff --git a/docs/source/images/z_axis_vars_v2.png b/docs/source/images/z_axis_vars_v2.png
new file mode 100644
index 000000000..a8df86aa1
Binary files /dev/null and b/docs/source/images/z_axis_vars_v2.png differ