In SPECTRAL mode, spiros simply needs to know the source positions (provided through the source_cat file) at which to extract spectra. The only important parameters in this step are the background method and the optimization statistics, and the remarks made before for image reconstruction do apply here as well. An RMF response is generated and attached to the derived spectra so that they can directly be used in XSPEC for spectral fitting. Extracted spectra are called ``spectrum_sourceID.fits''.