Examples of column densities associated with the dust components in two-dust models. The plots correspond to a combination of CMM and AMMI dusts and the model parameters FWHM = 0.5 pc and A_V = 1^mag. The left frames show the column density associated with the dust in regions of lower volume density and the right frames the column density associated with the second dust component. The density threshold for the transition between the components is n₀(H) = 1000 cm⁻³ in the upper and n₀(H) = 3000 cm⁻³ in the lower frame. The cyan contour is drawn at N(H) = 10²¹ cm⁻³.