Top: spectrum of the phase bin 0.0–0.2 from revolution 1132 fit with a power-law/rolloff model including the cyclotron line and an additional Gaussian component to account for a bump around 35 keV (see text). JEM-X (red and green), ISGRI (black), and SPI (blue) data are used. Middle: residuals for a fit with the model without the additional Gaussian component. Large residuals appear around the cut-off energy. Bottom: residuals after including the Gaussian emission component to model the bump.