Densities in K_s vs. i−K_s (left panel) and K_s vs. J − K_s (right panel) CMDs of 10⁵ synthetic sources. We drawn these from two different models: complete (solid line) and incomplete (dashed line). We construct the incomplete model using all objects in our data set, even those with missing values, while for the complete one we use only those object without missing values. The contour values (at 10⁻³, 10⁻², 10⁻¹, 4 × 10⁻¹) are the same for both complete and incomplete models.