Square root of filament power spectrum amplitude at s₀ = 10 pc^-1 versus mean line mass of each filament. The solid line shows the best-fit power-law . The corresponding mean N_H2-column density level is shown by the upper coordinate axis. The vertical dashed line separates subcritical filaments (cyan filled circles on the left) from supercritical filaments (blue filled circles on the right). (This figure is available in color in electronic form.)