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REV1 data are those data sets processed by SASS 6.0 or higher and distributed in the same FITS format used for REV0 data (i.e., , not the Rationalized Data File format used for REV2 data, see Sect. 9.4 below). When REV1 data are released to the archive, all the data products listed in Tables 9.1, 9.2, 9.3, 9.4, and 9.5 are archived with each data set as appropriate. However, some problems afflicting the REV0 data products - such as the PSPC timing error - have been corrected in the REV1 data.