Calibration Access and Data Handbook
It was meant to hold data about the calibration sources.
One extension per CCD containing intensity distribution as events /
second in RAWX/RAWY coordinates
One extension per CCD containing spectra in PI units per CCD
additional keywords provide a reference time and half life constants
to correct for time-dependent count rate.
The CCF contains one table:
- CCD index number (1-7).
- number of peaks in cal source spectrum.
- vector column of length N_PEAKS; lower PHA channel bound to bracket the peak.
- vector column of length N_PEAKS; upper PHA channel bound to bracket the peak.
- expected count rate from peak (units?) .