Upper panel: reconstructed RV due to spots and plages (black) and convection attenuation in plages (red), with no noise, for the set of lines S₁, full temporal sampling (with a 4 month gap every year), and method 1. Lower panel: reconstructed for a value of α that is 5% too high (purple) and 5% too low (pink) for the set of lines S₁, full temporal sampling (with a 4 month gap every year).