SPI data of one detector (00) between INTEGRAL revolutions 777 and 795 and spectral fits. Left: complete spectrum of SPI’s HE range between 2 and 8 MeV (top) and residuals (bottom). Right: zoomed-in view between 2.4 and 2.9 MeV, with individual lines indicated. The shown normalised residuals scatter around 0.04 with a standard deviation of 0.94 for the 6000 data points indicate a sufficiently well-described background spectrum fit.