Marginalised one-dimensional probability distributions (panels A, F, K, and P) and two-dimensional projections of the probability of dust parameters for τ_J = 6. The white star indicates the projected position of the χ² minimum. The other symbols are the χ² minima assuming a 10% higher or lower intensity for one of the bands, marked with green and red symbols, respectively. The circles correspond to J band, the diamonds to H band, the squares to K band, and the triangles to 3.6 μm band. The black contour shows the 1σ of the projection. The colour scale shows the normalised probability.