Quality of the fit of the simulated composite spectrum of KIC 11285625 (model 1a in Table A.3) with the gssp_composite software package. The radii ratio is 1.45, in agreement with the value reported by Debosscher et al. (2013). The simulated observed spectrum is shown with a light grey line, the black solid line refers to the best fit synthetic spectrum, the individual spectra of the primary/secondary are shown by the red dashed/blue dotted lines. The individual, RV-shifted spectra of the binary components were vertically shifted for better visualization.