Top left: deviation of the estimated value of spin-orbit angle (obtained from the best-fit model) from its exact value (used to generate mock RM) as a function of different configurations. See the text for details on the x-axis description. The red solid line with the circle markers shows the cases of aligned transiting planets (λ = 0 deg), the blue dashed line with square markers shows the cases of transiting planets with λ = 30 deg, and the green dotted line with triangle markers shows the cases of transiting planets with λ = 60 deg. Bottom left: same as the top panel, but for vsini. Top and bottom right: same as the top left and bottom left panels, but for the RM anomalies due to occultation with the stellar plages.