The following example produces a source spectrum and a background spectrum taken from an annulus about the source.
ICL> XSORT
XSORT Version 1.7-0
RAWDIR - Raw data directory > DISK$SCRATCH:[ASTERIX88.ARLAC.DATA]
Found 2 data files on DISK$SCRATCH:[ASTERIX88.ARLAC.DATA]
DISK$SCRATCH:[ASTERIX88.ARLAC.DATA]ARLAC.SDF;1
DISK$SCRATCH:[ASTERIX88.ARLAC.DATA]ARLAC_HDR.SDF;1
ROOTNAME - Rootname of files to sort /'ARLAC'/ >
OBSERVATION DATA-STARTS DATA-ENDS EVENTS FILT_STAT
53.0 6150.0 30611 OFF
DATASET - Output files required Event(E) Binned(B) /'B'/ >
Binned dataset selection
------------------------
1) XPIX
2) YPIX
3) XDET
4) YDET
5) Time
6) PHA channel
7) Corrected PHA channel
BIN_AXES - Enter integer codes of axes required in data array /'5'/ > 7
SHAPE - Shape of source area Circular(C),Rectangular(R) > C
GRP_RA - RA of the centre of the source box /332.02334594727/ > 332.173
GRP_DEC - DEC of the centre of the source box /45.501556396484/ > 45.7393
Source box centre azimuth = -752 elevation = -1712
RADIUS - Radius of source box (degrees) /1.171111/ > 0.05
Data array axes
*******************
3) XDET: 0 to 8192 (pixels)
4) YDET: 0 to 8192 (pixels)
5) Time: 53.000 to 6150.000 (seconds)
6) PHA channel: 1 to 256 (chn.)
7) Corr. PHA chan. 1 to 256 (chn.)
RANGES - Property ranges to change (enter numbers) /'7'/ > 7
MINEN - Minimum value of energy /8/ >
MAXEN - Maximum value of energy /256/ >
ENBIN - Bin width of corrected pulse height axis /1/ > 1
There will be 249 energy bins, each of 1 raw channel, starting from 8
BACK - Is a background file wanted (Y/N) /TRUE/ >
GRP_RAB - RA of centre of bckgnd box (dec. degrees) /332.173/ >
GRP_DECB - DEC of the centre of the bckgnd box /45.7393/ >
BRADINN - Inner radius of bckgnd box (degrees) /5.0000001E-02/ > 0.1
BRADOUT - Outer radius of bckgnd box (degrees) > 0.2
SRCFILE - Output source filename /@SRCS/ >
BCKFILE - Output background filename /@BGDS/ >
Processing observation DISK$SCRATCH:[ASTERIX88.ARLAC.DATA]ARLAC.SDF