The rmf.fits file is saved as defined by the OGIP Calibration Memo CAL/GEN/92-002.

The RMF fits file has two extensions: MATRIX and EBOUNDS. The MATRIX extension has columns: ENERG_LO, ENERG_HI, N_GRP, F_CHAN, N_CHAN, MATRIX. Read the documentation for details on each column, but the rmf is saved in the MATRIX part. The EBOUNDS extension contains a table of channel to energy relations: CHANNEL, E_MIN, E_MAX. Note that the numnber of rows in the MATRIX array must match that of the ARF.

The RMF energy range is from 5 keV to 85 keV in steps of 0.5 keV. 

The RMF was generated with the JEANT4 code for a 2mm thick CZT monolithic detector.

Only one RMF is needed.

