Top: Mrk 509 data (sum of Suzaku observations) and, in the subplot, data-to-model ratio. Bottom: unfolded data. Colour code for the different Suzaku instruments: XIS/FI-black, XIS1-red, and HXD/PIN-green. Three different models are shown, from left to right: double Comptonisation, blurred reflection and smeared absorption. Solid lines correspond to the best-fit model, and thin dashed lines to the model different components. For the three models a broad emission-line component is required. The energy on the abscissa is in the observer frame. The data were rebinned for clarity purposes.