Brightness profiles at 250, 350, and 500   μm. They are compared with the profile of the column density (dotted line). The surface brightness at 250   μm is fitted to a Gaussian source (grey line). The filaments are either confined by a medium with p_ext/k = 2  ×  10⁴   K/cm³ (top) or 10⁶   K/cm³ (bottom). The extinction through the filaments’ center is either A_V = 8   mag or A_V = 64   mag (left-hand figure and right-hand figure, respectively).