XTENSION= 'BINTABLE'           / HDU 1==========================================
BITPIX  =                    8 / 8-bit bytes
NAXIS   =                    2 / 2-dimensional Binary Table
NAXIS1  =                  160 / Number of bytes per row
NAXIS2  =                    0 / Count the rows!
PCOUNT  =                    0 / No group parameters (required keyword)
GCOUNT  =                    1 / One data group (required keyword)
TFIELDS =                   10 / Number of columns
EXTNAME = 'EVENTS  '           / EXTNAME, usually identical with HDUNAME
...
.............STANDARD FITS COLUMN SPECIFIERS INSERTED HERE............
...
COMMENT                                           +------------------+
COMMENT                                           | AXAF FITS   File |
COMMENT                                           +------------------+
COMMENT              *********************************************************
COMMENT              >    This file is written following certain AXAF-ASC    <
COMMENT              >    conventions which are documented in ASC-FITS-1.1   <
COMMENT              *********************************************************
COMMENT                        / Configuration control--------------------------
ORIGIN  = 'ASC     '
CREATOR = 'xxx - Version 0.0'
REVISION=                    0 / Processing system revision number
COMMENT $Id: ascfits.tex,v 1.3 1998/04/15 19:23:14 arots Exp arots $
CHECKSUM= '0000000000000000'   / ASCII encoded HDU checksum
DATASUM = '         0'         / Data unit checksum written in ASCII
CONTENT = '        '           / What data product
HDUNAME = '        '           / If no EXTNAME
HDUSPEC = 'ACIS Level 1 Data Products ICD, Version 1.0' / ICD reference
HDUDOC  = 'ASC-FITS-1.1: McDowell, Rots: ASC FITS File Designers Guide'
HDUVERS = '1.0.0   '
HDUCLASS= 'ASC     '
HDUCLAS1= 'EVENTS  '
HDUCLAS2= '        '
HDUCLAS3= '        '           / As needed ...
LONGSTRN= 'OGIP 1.0'           / The OGIP long string convention may be used.
COMMENT   This FITS file may contain long string keyword values that are
COMMENT   continued over multiple keywords.  This convention uses the  '&'
COMMENT   character at the end of a string which is then continued
COMMENT   on subsequent keywords whose name = 'CONTINUE'.
HISTORY   Input event file: hrcx123456789N000_evt0.fits
COMMENT
COMMENT                        / Time information block-------------------------
COMMENT
DATE    = '1998-01-01T00:00:00'  / Date and time of file creation (UTC)
DATE-OBS= '1998-01-01T00:00:00'  / TT, with clock correction if CLOCKAPP
DATE-END= '1998-01-01T00:00:00'  / TT, with clock correction if CLOCKAPP
TIMESYS = 'TT      '           / AXAF time will be TT (Terrestrial Time)
MJDREF  =                50814 / 1998-01-01T00:00:00 (TT) expressed in MJD (TT)
                               / MJD = JD - 2400000.5
TIMEZERO=                  0.0 / 0.0 is the cumulative clock correction
TIMEUNIT= 's       '
BTIMNULL=                  0.0 / Basic Time offset (s)
BTIMRATE=                 0.25 / Basic Time clock rate (s / VCDUcount)
BTIMDRFT=                  0.0 / Basic Time clock drift (s / VCDUcount^2)
BTIMCORR=                  0.0 / Correction applied to Basic Time rate (s)
TIMEREF = 'LOCAL   '           / No pathlength corrections
TASSIGN = 'SATELLITE'          / Spacecraft clock
CLOCKAPP=                    T / Clock correction applied
TIERRELA=               1.0E-9 / Short-term clock stability
TIERABSO=               1.0E-4 / Absolute precision of clock correction
TIMVERSN= 'ASC-FITS-1.1'       / AXAF FITS design document
TSTART  =                  0.0 / As in the "TIME" column: raw space craft clock;
TSTOP   =                  0.0 /   add TIMEZERO and MJDREF for absolute TT
STARTMJF=                    0 / Major frame count at start
STARTMNF=                    0 / Minor frame count at start
STARTOBT=                    0 / On-Board MET close to STARTMJF and STARTMNF
STOPMJF =                    0 / Major frame count at stop
STOPMNF =                    0 / Minor frame count at stop
TIMEPIXR=                  0.0 / Time stamp refers to start of bin
TIMEDEL =                  0.0 / Time resolution of data (in seconds)
COMMENT
COMMENT                        / Observation information block------------------
COMMENT
OBSERVER= '        '           / Name of Principal Investigator/Guest Observer
TITLE   = '        '           / Proposal title
OBS_ID  = 'xxxxxxxxxxxxxxx'    / Whatever the convention is ...
MISSION = 'AXAF    '           / Mission is AXAF
TELESCOP= 'AXAF    '           / Telescope is AXAF
INSTRUME= 'ACIS    '           / HRC, ACIS, EPHIN, S/C subsystems
DETNAM  = 'ACIS-I  '           / Detector name
GRATING = 'NONE    '           / Grating
OBS_MODE= 'POINTING'           / Pointing, slew, or scan
DATAMODE= 'FAINT   '           / Datamode (varies only for science instr. data)
SIM_X   =            0.0       / Position of SIM in mm
SIM_Y   =            0.0       /
SIM_Z   =         -237.4       /
FOC_LEN =        10065.0       / Assumed focal length, mm; Level 1 and up
ONTIME  =          100.0       / Sum of GTIs
LIVETIME=           98.0       / Ontime multiplied by DTCOR
EXPOSURE=           98.0       / Total exposure time, with all known corr. appl.
DTCOR   =            0.98      / Dead time correction
                               / Source information block-----------------------
OBJECT  = '        '           / Source name
RA_NOM  =               -100.0 / Nominal pointing
DEC_NOM =               -100.0 / Nominal pointing
ROLL_NOM=                -40.0 / Nominal roll angle, deg
EQUINOX =               2000.0 / J2000.0
RADECSYS= 'ICRS    '           / Julian coordinate reference frame
DATACLAS= 'SIMULATED'          / If fake data,
                               / include this (default is DATACLAS='OBSERVED')
END