SIMPLE  =                    T / Standard FITS format                           
BITPIX  =                    8 / Character information                          
NAXIS   =                    0 / No image data array present                    
EXTEND  =                    T / There may be standard extensions               
BLOCKED =                    T / The file may be blocked                        
ORIGIN  = 'ADC     '           / This file written at the ADC, NASA/GSFC        
DATE    = '23/09/91'           / Date file written (dd/mm/yy)                   
                                                                                
COMMENT                A Catalogue of Rich Clusters of Galaxies                 
COMMENT                                                                         
COMMENT The catalog is a compilation of data describing 4073 rich clusters of   
COMMENT galaxies, referenced by Abell number.  The data is divided into four    
COMMENT files; it includes the equatorial, galactic, and rectangular coordinates
COMMENT of the cluster centers.  Cluster redshift and magnitudes of certain     
COMMENT cluster members are also listed.  The catalogue is in four files which  
COMMENT contain data identical to the tables published in the original          
COMMENT reference.  They are follows:  the final northern Abell catalogue, the  
COMMENT final southern Abell catalogue, the supplementary southern Abell        
COMMENT catalogue, and the northern Abell clusters found during the southern    
COMMENT survey.                                                                 
COMMENT                                                                         
COMMENT Source Catalog Reference:  Abell, Corwin, and Olowin 1989, A&AS, 70, 1. 
COMMENT                                                                         
COMMENT Document Reference: Gessner, S. E. 1991, NSSDC/WDC-A-R&S 91-21          
COMMENT                                                                         
COMMENT A copy of the documentation should accompany any computer-readable      
COMMENT version of the catalog.  The FITS Table header(s) in this file only give
COMMENT the basic format of the catalog.  Please refer to the documentation or  
COMMENT source reference for a more detailed discussion of the data.            
                                                                                
END