SET/PROJECTION CORRECT

 

This command, applicable only to PSPC data, has to be used whenever   Projection is going to be run in correction mode. In this way, the output binned data will be automatically corrected for the vignetting and (optionally) for the dead time effects. When the correction mode is off (the default) N spectra, or N light curves or profiles generated by the Projection commands BIN AMPL, BIN TIME, BIN XPIX or BIN YPIX, are written to the columns labeled COUNTS_1, COUNTS_2, COUNTS_3, ..., COUNTS_N. If the correction mode is on, the labels CORR_1, CORR_2, CORR_3, ..., CORR_N and ERR_1, ERR_2, ERR_3, ..., ERR_N, containing the corrected data and the statistical errors, are added. The commands PREPARE/SPECTRUM and PREPARE/LIGHT_CURVE are compatible with both formats, and the correction vector to be used in the Spectral Analysis procedures is the same for all spectra. When the correction mode is on, each single photon will be corrected for the vignetting effects according to its detector position and its specific energy, and optionally for the dead time. Projection run in correction mode for vignetting only, shows no measurable increasing in execution time. When also dead time correction is included, the execution time might be increased up to 150%.
       
Example 1: Set Projection in correction mode: effective area and dead time corrections will be performed using the default calibration files EXSAS_CAL:effarea_pspcb.tbl and eventrates.tbl

Midas 001> SET/PROJECTION CORRECT

  Example 2: Set Projection in correction mode using the calibration files abc.tbl for vignetting correction, and def.tbl for dead time correction

Midas 001> SET/PROJECTION CORRECT=abc,def

  Example 3: Set Projection in correction mode using the calibration file effarea_pspcc.tbl for vignetting correction. Dead time correction is not applied

Midas 001> SET/PROJECTION CORRECT=effarea_pspcc