Definitively YES. While in the normal case newer calibration files can be used
by former SAS versions, there is a problem with SAS 9.0. The calibration files
needed for a proper RGS contamination effect correction
(RGS[1][2]_EFFAREACORR_0006.CCF) contain a large number of epochs for coping
with the temporal variation of the contamination, while SAS 9
was (by mistake) limited to work with 4 epochs by this correction. As a result
the only way to keep properly working with SAS 9 is avoiding a CCF calibration
update. This can have as consequence a miscalibration of RGS data, especially
the one corresponding to the last 2 years.
Due to a possible mismatch between SAS version and calibration files (most of
you update the CCF automatically through rsync) we will delay the release of the
RGS[1][2]_EFFAREACORR_0006.CCF calibration files for a week after the SAS 10
release.
