Temperature profile of B207 obtained by fitting the SED at the FIR wavelengths. The temperature decreases to about 11 K in the core compared to the surrounding medium of 14 K. We used these estimated temperatures in Planck’s function to calculate optical depths at 500 μm to estimate column densities. The column density, N(H), at the core is about 7.2 × 10²² cm^-2, causing an extinction of about A_V = 48, assuming R_V = 5.5 for molecular clouds, and assuming the aggregate (AMM and AMMI type) dust grain opacity from Köhler et al. (2015).