The (T, β) probability distributions calculated for sources B-1, B-2, B-3, and B-4 using the MCMC method. The contours correspond to 90% confidence regions. The black circles indicate the maximum-likelihood solutions that were obtained with Herschel data in the range 160–500 μm. The contours of all cases are shown in the rightmost column and bottom row, similarly as in Fig. 11.