SPFDHXS performs spectral fitting to the GRS data. The routine SPFDGRS runs on the only SUN workstation. First you choose a time interval of the flare data.
The steps are identical to those described for SPFDHXS in the previous section, just use OUT_GRSPHL1 instead of OUT_HXSPH (and OUT_GRSPHL2 for GRS-2). Use SSPLOT_GRS and WRITE_GRSPH instead of SSPLOT_HXS and WRITE_HXSPH. There is a simplified routine called TEST_OUTG which is similar to TEST_OUTH. The default name of the text file with the data to be fit is GRS_SPECTRUM.DATA
Next you set a spectral function out of single power law, broken power law and power law plus Gaussian in a file of grs.model. This file must be in the executing directory of spfdgrs. You can set the parameters in a similar way to hxs.model. NOTE: Maximum numbers of fitting parameters and fitting models are 62 and 30, respectively.
The Unix and IDL routine to perform the spectral fitting is spfdgrs, and the results are read with READ_SPFDGRS. The default name of the results file is GRS_RESULTS.DATA. You plot the spectrum with SPFDPLOT_GRS.