Observed spectra measured by the imaging detectors (left) and the BKG detector with pixels 2 & 5 (right) are shown (in black). The spectra is taken in the impulsive phase during a nonthermal burst with inserted attenuator. For the imaging detectors, we fitted the energy range 11−100 keV as denoted by the vertical dotted lines. For the BKG detector, we fit the energy range 6−25 keV. In green the total fit is given with a super-hot (red) and a hot (orange) thermal model, a thick target model (blue), and the albedo (grey). The background counts are given in light blue. The plots below the spectra show the residuals of the fits.