Distributions in log-log space of the total column densities derived from the C¹⁸O observations (blue) in the B213-L1495 by Hacar et al. (2013): upper panel: total column densities for all the positions fitted with at least one component with S/N ≥ 3; lower subpanels: corresponding column density distributions for positions with a number of N_peaks = 1 to 5. Those positions containing at least one dense component (S/N(N₂H⁺) ≥ 3; red line bars) and cores (S/N(N₂H⁺) ≥ 6; solid-red bars) are indicated in histograms in the corresponding plots.