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Purpose: To cast vignetting and detector-artifact corrected exposure
maps in sky coordinates using the ACTIME.DAT accepted times file. The
exposure maps are cast in pixels which match the detector maps.
This pixels size is 
.
File Input:
1) Observation data set fits files - xxx_ATTITUDE.FITS and
xxx_EVENTRATES.FITS for German data, xxx_ATTITUDE.FITS,
xxx_LIVETIME.FITS, and xxx_GTI.FITS for US data, xxx_ANC.FITS and
xxx_BAS.FITS for RDF data.
2) Other fixed input - ACTIME.DAT modified as desired. This must be the
same time selection as used with the programs CAST_DATA_HRI and
CAST_PART_HRI.
Interactive Input:
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) 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.
4) Nominal roll angle in radians - necessary for US data only. The value
can be found in the HISTORY records of the xxx_ATTITUDE.FITS header.
Screen Output:
1) Diagnostic Information - information about the accepted time and
observation live time.
Image Output:
1) Fits file of the exposure map: expose.fits.