Bisector variation with inclination i and differential rotation parameter α of the Fe i line at 617.3 nm for the G2V and M0V simulations. For the variation of α (left panels) the inclination was fixed at i = 60°; for the variation of i (right panels) the differential rotation parameter was fixed at α = +0.2. For all calculations υsini = 5 km s^-1 was used.