... HST . WF/PC-1 Data Handbook . ... HST Overview . ... The types of WF/PC-1 reference files, along with their suffixes, are listed in Table 44.2; the b* suffixes refer to the associated data quality files. The rootname of the reference file is based on the time that the file was delivered to the Calibration Data Base System (CDBS); the file names and history of all WF/PC-1 reference files in CDBS (and retrievable from the HST Archive) are contained in the Reference File Memo on the WWW: . ...