This file contains important information about the SIS response matrices
found in this directory

These matrices supersede the previous set (93dec20).

The only difference between the 94jun20 and 93dec20 matrices is the
proper inclusion of incomplete charge collection. Unless compensated
for, this effect leads to a slight excess of counts at energies below
about 5 keV. However, the effect is small and depends on source
spectrum. For example, if a 20,000-count spectrum from a "typical" soft-
excess AGN is analyzed, all the error bars derived by fitting with the
new matrices overlap with those derived with the old matrices. However,
despite the overlapping error bars, the flux of the best-fitting soft
excess is 45 per cent higher with the new matrices.

Please note that the matrices are named following the same convention as
described in the ABC Guide (section 9.9.2 of the current version) EXCEPT
that the version number of the response generator has been appended, as
in the following:

   /caldb/data/asca/sis/cpf/94jun20/s0c1g0234p40e1_512v6_0.rmf (new matrix)
   /caldb/data/asca/sis/cpf/93dec20/s0c1g0234p40e1_512.rmf   (old matrix)

As before, the RSP files correspond to the "standard" extraction radius
of 4 arcmin (38 pixels with the default, factor-of-four rebinning) and
to the standard pointing positions.