Description

FARF is a file-based ARF model that represents an ancillary response vector (e.g., the effective area as a function of energy/wavelength).

Note that in Sherpa analyses, the energy-space binning of the ARF (found typically in the ENERG_LO and ENERG_HI columns of the SPECRESP extension of the ARF file) does not have to match the analogous energy-space binning of a matching RMF. (This is also true if instead of energy, the ARF is defined as a function of wavelength.)

See the documentation on the INSTRUMENT command. See also the RSP and FRMF instrument models.

FARF Parameters