The calibration steps carried out by CALHRS are selected by the values of keywords in the Science Data header. The values for these keywords are set according to the instrument configuration as indicated by the packet format code (keyword PKTFMT). Prior to calibration these keywords contain the values: OMIT or PERFORM. After processing by CALHRS switches originally set to PERFORM are reset to COMPLETE. Some processing steps require additional data in the form of reference tables and files. The file names of these reference data are also contained in keywords in the Science Data header.
