Calibration Access and Data Handbook

CAL_getEbounds

returns the correspondence between PI channels and energy ranges. The raw PHA channels are converted to approximate energy values in the form of PI channels. However the response matrix distributions are provided also in PI channels, but typically in a fixed set of energy ranges. TBD, these might be semi-log spaced to account for the changing CCD energy resolution and to the reduced photon statistical accuracy at the highest energies. Therefore the upper and lower energy limits per response bin are to be converted between PI channel and energy.