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Fig. 6

image

Upper panels, left and right: two example spectra of V 0332+53. Obs. 2 is one of the two observations with the highest count rates while Obs. 6 is the data set with the highest count rate with all the instruments available (black, red, and green correspond to PCA, HEXTE, and XRT, respectively). Lower panels: behaviour of the residuals when adding the different components one by one. The number in the right corner of each panel indicates the best-fit statistics (χ2/d.o.f.). From upper to lower panels: 1) best fit using the cutoffpl model component only (i.e. continuum model); 2) residuals after adding the ≈ 10 keV absorption feature to the continuum model; 3) residuals after adding the cyclotron feature; 4) residuals after adding the Fe Kα line to the model (and final residuals of the model). The same vertical axis is used in both panels.

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