layout: ffffff_%%%%w$@zz$.xxxx (= one letter per field) where: ffffff = Any alpha-numeric string, but normally the OP-number preceded by 'OP' or else the FOTnumber of the tape consisting of 6 letters. %%%% = observation sequence number as unique within one FOT. '0000' for general FOT (auxiliriary) data w# = wfc camera id (either w1 or w2) '__' for general FOT data @ = observation mode (either s = slew or p = pointing) No distinction for 'initial' or 'final' slew and not relevant for general FOT data. zz$ = instrument/derived contents where $ is a number indicating the level of processing hs$ = housekeeping science hi$ = housekeeping instrument rn$ = rate normal rh$ = rate high ba$ = background analysis dr$ = diagnostic reduced de$ = diagnostic extended rp$ = pseudo-events ib$ = packet block info rc$ = calibration source events pk$ = peak rates dt$ = dead times gn$ = gain values for general files '%%%%w#@zz$' will be any of the following 0000__eph0 = ephemeris data 0000__att0 = attitude data 0000w#att0 = attitude data 0000__utc0 = OBT tp UTC converison date 0000__obs0 = observation survey file 0000w#hit0 = IT housekeeping data additional files 0000w# = for all files pertaining to the whole OP for a particular camera .xxxx = extension part. For data files of FITS format it will be '.fits', for GTI files it will be '.gti.', for asci text files it will be '.txt', and for PostScript files it will be '.ps' It is not advisable to run Stage-II processes on raw data file ($ = 0) However it is possible to pass cleaned and filtered files to it ($ = 1) as well as position corrected files ($ = 2) A full description of all files, their naming and contents can be fiound in document (TBD) "Description of SAX/WFC files produced by Stage-I"