Observed spectra and best-fit model of epoch I (left) and epoch II (right). The two panels marked (a) show the Suzaku spectra (XIS0: green; XIS1: red; XIS3: blue; PIN: purple) and in case of epoch II (right) the combined RXTE spectrum (PCA: orange). The black line is the best-fit model. Each inset zooms into the iron line region between 5 and 8 keV and shows the residual flux with respect to a model without any fluorescence lines. The modeled fluorescence lines are shown in gray. Panels marked (b) show the residuals of a fit to a model without the cyclotron lines included. The arrows labeled E_n mark the best-fit position of the nth cyclotron line (if significant within the error bars, see Table 1). Panels c and d: residuals of our best-fits using CYCLABS and GABS to model the cyclotron lines, respectively.