Per-Observation Detections RMF Files (rmf3.fits)
The redistribution matrix file consists of a single FITS format file for each source region of each ACIS observation that records the weighted RMF for the areas of the detector over which the source region for an observation dithers.
Source Region RMF
The per-observation RMF FITS file is named: 〈i〉〈s〉〈obs〉_〈obi〉N〈v〉[_〈c〉]_〈r〉_rmf3.fits
where 〈i〉 is the instrument designation, 〈s〉 is the data source; 〈obs〉 is the observation identification; 〈obi〉 is the observation interval identification; 〈v〉 is the data product version number; 〈c〉 is the cycle; and 〈r〉 is the region ID, formatted as "rnnnn", where nnnn is the 4-digit region number, formatted with leading zeros. The optional discriminator identified in square brackets is included only for ACIS alternating exposure (interleaved) mode observations.