Constraints (posterior probability contours and marginalized PDFs) on the statistical properties of the dust density and magnetic field for the simulation A maps. On the posterior probability contours, the filled dark and light blue regions respectively enclose 68.3% and 95.4% of the probability, the black stars indicate the averages over the two-dimensional posterior PDFs, and the red circles indicate the input values for the simulation. In the plots showing the marginalized posterior PDFs, the light blue regions enclose 68.3% of the probability, the dashed blue lines indicate the averages over the posterior PDFs, and the solid red lines indicate the input values for the simulation. The upper right plot displays the correlation matrix between the fitted parameters.