In (a) and (c), colored lines represent the path of dark spots as the star rotates at different latitudes. In (a), the rotation axis in the plane of the sky, in (c) the rotation axis is tilted by 0.5 rad towards the observer with respect to the sky plane. (b1)/(d1): effect on RV of the imbalance break between the approaching an receding limb (ɡ_ph in Eq. (13)), (b2)/(d2): RV convective blueshift inhibition effect on RV (ɡ_cb in Eq. (14)), (b3)/(d3): effect on photometry of the stellar surface darkening (h in Eq. (15)).