Summary release note for pipeline 04000006/20010907.155438

This note describes the changes between the previous production pipeline and 
the new one. The previous production pipeline (02000037/20010806.101411) used 
SAS 5.1.2 (xmmsas_20010727_1900), becoming operational on 2001-08-06T10:14:11. 
The new pipeline (04000006/20010907.155438) uses the pipeline-only SAS version 
5.1.4 (xmmsas_20010904_1900), it became operational on 2001-09-07T15:54:38.
SAS 5.1.3 was very similar to SAS 5.1.4, but was never used in the operational 
pipeline.

Brief summary of scientifically important pipeline changes:
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EPIC flux values in source lists corrected. EPIC flare background timeseries 
is a new product. EPIC MOS bad pixel finding scheme improved, uses 
embadpixfind, rather than previous PN scheme. EPIC PN burst mode energy 
calibration improved. OM photometry and source lists significantly improved.
EPIC sources out of the RGS FOV excluded from RGS analysis. 

At about the time that the change to pipeline 04000006/20010907.155438
was made, the catalogue cross-correlation subsystem was modified to
version 4.69. This version reduced the finding chart size from 4x4 to 2x2
arcminutes, the grey-scale of the Rosat images was modified to have a
maximum of at least 10 counts to avoid noise features appearing like
sources, and the axis labelling of the PDF plots was improved.