Radial profiles of column density and LoS-averaged dust temperature of B 68 (cf. Fig. 9 of Nielbock et al. 2012 for the ray-tracing results of the same data). Small black dots show the data pixel values over radial distance from the column density peak (see Fig. B.8). Solid gray lines show best fits to these data with Eqs. (3) and (8) and the parameters listed in Table 5. The parameters are also labeled on the diagram axes to illustrate their meaning, with the following characteristic radii: r₁ = flat core profile radius (Eq. (3)), r_1′ = radius to define consistent dense core boundary (Eqs. (10) and (11)), r₂ = cloud radius at transition to halo (Eq. (6)), and r_out = outer cloud boundary (Eq. (3)).