ii_spectra_extract

ii_spectra_extract reads the shadowgram for each input energy band and creates a spectrum for background and each source from isgri_srcl_res.fits file. The result is written to the ISGR-EVTS-SPE and ISGR-EVTS-SPE-IDX Data Structures.

Table: Content of the ISGR-EVTS-SPE Data Structure.

Column Name	Description
CHANNEL	Channel number
RATE	Countrate in the given channel
SYS_ERR	Systematic error
STAT_ERR	Statistical error
QUALITY	Quality flag
GROUPING	Grouping flag

Table: Content of the ISGR-EVTS-SPE-IDX Data Structure.

Column Name	Description
SOURCEID	ISDC unique source identifier
RA_OBJ	Source right ascension in degrees
DEC_OBJ	Source declination in degrees
TFIRST	Time of the first data element
TLAST	Time of the last data element
TELAPSE	Total elapsed time of the data