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Purpose: To cast vignetting and detector-artifact corrected exposure maps in sky coordinates in any of 13 pulse-height bands using the valid_times.dat accepted times file. The exposure maps are cast in pixels which match the detector maps. This pixels size is . This is almost, but not quite the pixel size of the SASS produced images which bin the sky positions by 30. This amounts to a one-pixel difference at the outside radius of the observation.
1) Observation data set fits files - xxx_ATTITUDE.FITS and
xxx_EVENTRATES.FITS for German or US data, xxx_ANC.FITS for RDF data.
2) Other fixed input - valid_times.dat modified as desired from the output of program VALID_TIMES. This must be the same time selection as used with the programs CAST_DATA, CAST_PART, LTE, and TILT. After the selection of the desired band in the interactive input (see 4) below), the program will read in the appropriate detector map. The diagnostic information file xxx_diag.out produced initially by CAST_DATA will have additional data appended to it.
1) Observation control - the eight or fewer character string listed above as xxx.
2) Data format control - 1 for German data, 2 for US data, 3 for RDF data.
3) Detector control - 1 for PSPC C (before 26 January 1991, S/C clock 20530000), 2 for PSPC B (after 26 January 1991).
4) Pulse-height band control - input 1-13 for various pulse-height bands or combinations of bands. Note that the R1 band detector map (high-gain channels 8-19) should be used for the R1 band at high gain and the R1L band at low gain. The R1L band detector map (channels 11-19) should only be used for the R1L band at high gain.
5) Nominal pointing direction - the nominal pointing direction (in decimal degrees) taken from the observation data set hard copy or the header information of the observation data set fits files.
1) Diagnostic output - information about the accepted time and observation live time, see 2) of File Input
1) Fits file of the exposure map for the selected pulse-height band (expose_n.fits where n is the band number).