Processing status of the archive data

The standard analysis software system (SASS) is used to process the raw telemetry from the satellite into a format that users can work with (using ASTERIX). In January 1994 a new version of the SASS was introduced. From this date all new data entering the archive was processed to this standard, known as ``REV2". In addition, a programme of reprocessing of the old REV0 and REV1 datasets (ie. those originally processed before Jan. 1994) was undertaken. This procedure is now almost complete; only 3% of the archive remains to be converted into REV2 format. This should not be a major issue for most users; the ASTERIX system uses interface routines which convert each type of dataset into the standard HDS formats. The precise details of the construction and contents of each set of files downloaded from the archive are therefore of minor importance. The existence of REV0/1 data in the archive is mentioned here only for completeness.