The output file is an OGIP-compliant Response Matrix File (RMF) with the following extension tables. Only the non-standard elements are described here.
Attribute LO_THRES documents the value of the response threshold used when writing this extension. Channels with this value or less are considered empty and do not occupy space in the output. At present the user has no control over this threshold.
This extension is present only if the file was created with withangdist=yes.
| PHI0 PHI1 | real32 | arcmin, dispersion angle bin boundaries |
| VALUE | real32 | distribution value at this bin |