move egm96 note

ut-issl · Feb 15, 2024 · 2a5aba4 · 2a5aba4
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diff --git a/ExtLibraries/README.md b/ExtLibraries/README.md
@@ -6,9 +6,4 @@
     - For celestial body's information
   - [NRLMSISE00](https://www.brodo.de/space/nrlmsise/)
     - For precise air density model around the earth
-  - [EGM96](https://cddis.nasa.gov/926/egm96/egm96.html)
-    - For geopotential coefficient table
   - others
-
-## Note
-- Currently, we cannot access the original download page of the `egm96_to360.ascii` coefficient table file. Therefore, we decided to provide the table file in this repository.
diff --git a/data/external/README.md b/data/external/README.md
@@ -0,0 +1,7 @@
+# external data
+
+## EGM96: https://cddis.nasa.gov/926/egm96/egm96.html)
+geopotential coefficient table
+
+### Note
+Currently, we cannot access the original download page of the `egm96_to360.ascii` coefficient table file. Therefore, we decided to provide the table file in this repository.