Top: Doppler map of the He ii λ4686 line of HD 150136 computed after removing the absorption line profiles of the primary and secondary stars, as well as of the third component. The crosses correspond to the radial velocity amplitudes of the primary and secondary stars. The shape of the Roche lobe in velocity space (thick dashed line) was calculated for a mass ratio (primary/secondary) of 1.6. The Doppler map was computed with v_z = 0 km s^-1. On the colourscale, red (blue) indicates the maximum (minimum) emissivity. Bottom: same as for the upper panel, but for Hα.