Effect of properties of stellar spots on the RV (top panels) and CRX (middle panels) phase curves and on the RV-CRX correlation (bottom panels) for a mid-M dwarf. Simulations of varying ff (left panels), ΔT (middle panels), and CS (right panels) are shown while keeping the other parameters constant to a set of reference values. These reference values are 1.7% for the filling factor, 250 K for ΔT, and 0 m s⁻¹ for CS. We note the different vertical scale in each plot, and that the horizontal axes are different in the bottom panels.