Calibration Access and Data Handbook

Description

Currently not used in the SAS, but may be in the future. Is a placeholder that was supposed to have either some real background spectra or some coefficients with which to generate background spectra. It is currently not used, however might by used for a future task that takes as input some proxies like the RA & Dec, the ROSAT broad band count rates for the target location, the corner count rates etc. and generates a best guess background file.