Radial column density profile of the main (left column) and secondary (right column) filaments. The dots, connected by the red solid line, show the mean profile across the filaments, while the shaded area indicates the standard deviation. In the top row the average profiles were estimated from the ¹³CO and C¹⁸O(1−0) derived column density (Fig. 5, top panel), while in the bottom row we used the column density estimated by Elia et al. (2013). The black solid line represents the best fit profile, following the formulation in Arzoumanian et al. (2011).