new ACIS background files

From: Maxim Markevitch (maxim@head.cfa.harvard.edu)
Date: Sun Nov 30 2003 - 09:14:28 EST

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Dear ACIS background users,

I have made some significant improvements to the ACIS
backgrounds. Most interesting changes are the tgain
correction for C and D; extension of the aciss_D dataset
(the exposure for the S1+S3 subset increased from 50 to 170
ks); and completely re-made files for period B (which now
includes the PSU-corrected versions).

The new files, as well as a complete list of changes, can be
found at http://cxc.harvard.edu/contrib/maxim/acisbg/

Enjoy
Maxim Markevitch

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