Possible i,R,v_rot combinations in agreement with the observed vsini = 28   km   s^-1 of the primary (left) and the vsini = 170   km   s^-1 of the secondary component (right). Plots show (via colours and thin black curved contour lines) rotation periods calculated from the observed projected rotational velocities at given i,R values. The thick contour line corresponds to the main peak at 1.898 d from the frequency spectrum, and the dashed, continuous, and dot-dashed red lines show the break-up velocity (with speeds rising towards the left) for ℳ_max, for ℳ, and for ℳ_min, respectively. The thick contour line corresponds with the parameter-combinations that fit the hypothesis in Sect. 3.3, and the white dot shows the location of the most probable R (and thus i) value from Table 2.