rmfgen
generates the RMF based on
the properties of only one CCD chip of the instrument.
In the case of the MOS, this is central
chip. In the case of the PN, this is chip 1,
ie the chip closest to the optical axis in quadrant 0.
A mechanism for providing an emission-weighted RMF
will be implemented once DSS support has been coded.
The size of the o/p RMF is dependent on
the spectrum binsize and the number of bins
in the energy grid, and can be very large.
Heavy consumption of disk space is expected.
Memory consumption will also be high as the full RMF is
held in memory before being written to disk.
Note that
the pile-up correction requires knowledge
of the entire uncorrected response matrix
during each row construction,
but accesses this from the CAL, not from memory.