Light-to-mass ratio (L/M) of the dust luminosity and the core mass as function of the dust temperature of embedded cores. The derived ratios are labelled with the assumed extinction values A_V through the filaments center. The ratios L/M_core(T_dust) obtained for cores that are embedded in cylindrical and spherical filaments for each given external pressure p_ext/k (2  ×  10⁴, 10⁵, 10⁶   K/cm³) are fitted by a polynomial function shown as solid black lines. The points for mean ISM pressure are fitted also by a simple power law (dotted curve).