1 CAT_library Version 9.0 o Null values are no longer supported for _LOGICAL columns. Version 8.4 o Catalogue name may now include non-alphanumeric characters. Version 8.3 o Cataloguues now have attributes PATH and BACK, holding the full path to the catalogue file and the back-end type. Version 8.1-4 o No longer writes 'D' format floating point values to TST catalogues. Improves interoperability with other TST handling applications, like Skycat and GAIA. Version 8.1-2 o Now builds using autoconf o Now released under the GPL Version 8.1 of the CAT subroutine library for manipulating astronomical catalogues and tables has recently been released. The CAT library can access catalogues and tables held in a number of formats, including FITS tables and simple text files in the Small Text List (STL) and Tab-Separated Table (TST) formats. The major change in version 8.1 is the removal of support for the CHI/HDS catalogue format, which was little used. If you continue to require access to catalogues in this format then please contact me at the e-mail address given below and I should be able to provide a work-around. There are no other major changes in version 8.1, just some bug fixes and minor enhancements. The CAT library is documented in SUN/181. A C Davenhall (acd@roe.ac.uk), 4 April 2001.