SEDs of the sources B-1, B-2, and B-3, fitted with the YSO models of Robitaille et al. (2007). Filled circles show the fitted 2MASS (J, H, Ks), WISE (3.4, 4.6, 12.0, 22.2 μm), AKARI (only for B-1 and B-2) and Herschel (Getsources: 160, 250, 350, 500 μm) fluxes shown in Table 2. Error bars are shown, but they are often smaller than the data points. The solid black line shows the best-fitting model, and the possible grey lines show the models that fit the criteria , where is the χ² value per data point of the best-fitting model (for B-1 and B-3), or the ten best models (B-2). The dashed line shows the stellar photosphere of the best-fitting model. (Bottom right) B-3 fitted with only NIR–MIR data and using a wide distance range (20–800 pc).