Examples of log-Gaussian degeneracies. Six pairs of 512 × 512 patches are chosen, whose locations on the scatter plot of Fig. 10b are given there by the red stars. The column density maps are shown in units of 10²⁰cm⁻². For each patch, we report: s the subsampling factor from the original 3″/pix map, d and b the approximated distance and Galactic latitude of the cloud. If a pair has patches (i, j) with incompatible pixel sizes according to the following criterion $max\{\frac{s_i{d}_i}{s_j{d}_j},\frac{s_j{d}_j}{s_i{d}_i}\}\ge 3/2$, we color its labels in red.