Panel a: values of the UV field following the Hocuk et al. (2017) parameterization for TMC 1-C (blue) and TMC 1-CP(red) cuts (dashed lines). We also show the best fit (solid line) for the whole TMC 1 region, with χ_UV (TMC 1) = 5. Similarly, in panel b, the parameterization yields a Draine field of χ_UV(B1b) ~ 24 for Barnard 1b. It is worth noticing the raise of dust temperature in the A_v > 30 mag region, probably due to the FHSC heating of dust or the presence of a thick ice covering.