This directory contains .tar.gz files containing the ic, idx, and cat directory 
trees of the INTEGRAL data archive.  Queries to the HEASARC INTEGRAL archive 
will yield download scripts for source specific data found in the aux and scw 
directory trees. Additionally, data from the ic, idx, and cat directory trees is 
required for analyzing INTEGRAL data using the Off-Line Scientific Analysis 
Software (OSA).  Users should download and unpack these three data files under 
the root directory of their local INTEGRAL archive.  This data is not source 
specific and can be used for analysis involving all source specific data present 
in the archive at the time of download. As new source data enters the archive, 
the ic. idx, and cat data is also updated.  Hence users should be sure to keep 
this data up-to-date.