Example of the different distribution of C_⋆ in Δmag in different passbands using the PS1 reference sample. We note that source with high positive C_⋆ tend to have positive residuals in g_PS1 and negative residuals in r_PS1. Also, most of the outliers in both plots are accounted for by sources with (relatively) large absolute C_⋆ values and by sources classified as variable (see also Fig. 8).