Top panel: mass per unit length against background column density for the selected sample of 599 filaments. The horizontal black line corresponds to M_line = M_line,crit = 16 M_⊙pc⁻¹, and the grey area shows the transcritical filament regime with (cf. Table 5 and Sect. 5). Bottom panel: same as the top panel, where each dot representing a filament is color coded here as a function of column density contrast C⁰ (the color code is shown on the bottom right). The percentages of filaments with C⁰ < 1, 1 < C⁰ < 2, and C⁰ > 2 are about 70%, 23%, and 7%, respectively, in the selected sample.