Merge pull request #195 from sot/remove-ref-to-text-files

Update for public use.

docs/catalog-description.rst

@@ -69,21 +69,31 @@ Version 1.8 includes improved star positions and proper motions from Gaia
 DR3, as well as improved estimated magnitudes derived from Gaia DR3 photometry
 and more than 94,000 ACA observed stars. 
 
+
+Use of the AGASC 1.8 in Chandra Operations
+==========================================
+
+The Chandra Aspect Team uses an HDF5 version of the AGASC 1.8 data and
+the Python agasc package https://sot.github.io/agasc/index.html. References
+in this document to the agasc package refer to that Python code.
+Contact [email protected] if you would like to use the catalog
+directly with that Python package.
+
+
 Organization of the FITS Data Files
 ===================================
 
 The top directory includes the files::
 
     ----------------------------------------------------------------
-    readme.txt    - Introduction. ASCII
+    readme.txt    - this file
     agasc         - Directory for AGASC FITS region files.
     tables        - Directory for AGASC supporting tables.
     ----------------------------------------------------------------
 
 In the tables subdirectory are these tables::
 
     ----------------------------------------------------
-    comments.txt  - Introduction and general comments. ASCII
     regions       - Boundaries of GSC regions. FITS binary table
     lg_reg_x      - Index to large regions. FITS binary table
     sm_reg_x      - Index to small regions. FITS binary table