Marginalised probability distributions of dust parameters for the TMC-1N τ_J = 6 position. The grain albedo in the radiative transfer calculations is changed by −10% (red lines) or +10% (purple lines), compare to Fig. 15. For the surface brightness data σ_NIR = 20% is assumed. The stars indicate the projected positions of the χ² minima. The greyscale map corresponds to the red lines and the contours show 1σ and 2σ.