Combined GOES-STIX analysis. (a) GOES SXR fluxes showing the thermal emission of the M1.6 flare. (b) STIX HXR count rates in five broad energy bands. The STIX times have been shifted to be consistent with the GOES observations from 1 AU. Results of the spectral fitting of STIX spectra show: (c) the background-subtracted STIX count rate in the 25–50 keV range, (d) the spectral index of the injected electrons (δC shows the correlation coefficient with the count rate), and (e) the injected electron flux above 15, 50, and 100 keV. The five major non-thermal peaks are indicated by dashed red lines.