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Examples

To background subtract a time series

  ICL> XRTSUB
  SOURCE - Name of source file > SRC
  BCKGND - Name of background file > BACK
  OUT - Name of output file > SUB
  RESPFILE - Name of response file /'XRTCAL:DRMPSPC'/ >
  EFFILE - Name of effective area file /'XRTCAL:PSPCB_EFF'/ >
  RTNAME - Rootname for calibration files > QFIELD
  Mean position correction factor: 1.01

To subtract an HRI spectrum - MUST turn off the positional correction.

  ICL> XRTSUB PCORR=NO
  SOURCE - Name of source file > SRC
  BCKGND - Name of background file > BACK
  OUT - Name of output file > SUB

To subtract a PSPC image

  ICL> XRTSUB
  SOURCE - Name of source file > IMA2
  BCKGND - Name of background file > BACKANN
  OUT - Name of output file > IMSUB
  RESPFILE - Name of response file /'XRTCAL:DRMPSPC'/ >
  EFFILE - Name of effective area file /'XRTCAL:PSPCB_EFF'/ >
  RTNAME - Rootname for calibration files > QFIELD
  BIMAGE - Name of Background image > BACKIM
  Estimated 222.3 particles in the background box: 1.5 percent of total
  background

To produce a particle spectrum file

  ICL> XRTSUB PART_FILE=PFILE

To produce a file containing the actual background removed and set the mininum variance from the input background file to be one.

  ICL> XRTSUB BGMODEL=REALBGD BDEFVAR=1.0

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