Keyword Position Type Description
------- -------- ---- -----------
INSTR 1 CHAR Instrument name e.g. 'WFC' or 'XRT'
SCOUNT 2 REAL Total counts from source
BCOUNT 3 REAL Counts from background per square arcmin
AZIMUTH 4 REAL Off-axis azimuth (arcmin)
ELEV 5 REAL Off-axis elevation (arcmin)
ENERGY REAL Mean energy of source photons (keV)
DMJD DOUBLE Modified Julian date of observation
(WFC only)
IFILT INTEGER WFC filter number
DISP LOGICAL Display the result ?
Default = YES
RADIUS output REAL Radius of circle giving best S/N ratio
(arcmin)
MAXFRAC output REAL Fraction of counts within best radius