This task adds spectra, background spectra and response matrices of both instruments and same spectral order (wavelength bining), to produce combined files that can be used for quantitative analysis in a spectral fitting package such as Xspec. The component spectra should have been produced by rgsproc, using the spectrumbinning parameter set to lambda.
The task differs from rgsfluxer, in that it is able to combine response matrices and produce a single response matrix for spectral analysis. The spectra attributes and response values, bar counts, are weighted prior to addition, in terms of the exposure time and areascal of the individual observation. In this way the spectra (NET or TOTAL), including background spectra, can be combined.