Profiles of the companion SED z for different levels of the companion regularization (µ_z = 10² in dashed orange, µ_z = 10⁵ in blue, and µ_z = 10⁷ in dotted green) in the top panel. Differences between the profile for µ_z = 10⁵ and the profiles for µ_z = 10² (dashed orange) and µ_z = 10⁷ (dotted green) at the bottom. For all these results, the stellar hyper-parameters are µ_x = 10 and µ_y = 1.