Trailed spectra and Doppler maps. The lower left plot presents the Doppler map corrected for γ_WD, the lower right plot the corresponding one corrected for γ_MS. The slanted and the straight cross mark the calculated positions of the stars, i.e. K_WD and K_MS, respectively. The upper plots show the trailed spectra for γ_WD. The left spectrum represents the original data, the right spectrum is the reconstructed data from the Doppler map. The data are repeated for a second orbital cycle for clarity.