STIX background-subtracted count flux spectra around the nonthermal (left) and thermal (right) peaks. Both spectra can be well fit with an isothermal (red) component plus a thick target model (blue). The magenta curves correspond to the sum of the two components, and the dashed black curves represent the STIX background spectra taken during nonflaring times close to the event. Below each spectrum, we report the residuals (observations minus total fit) in units of the standard deviation calculated from counting statistics. The resulting fit parameters are shown in the legend of each plot.