Histograms of physical parameters of 68 selected filaments in Vela C. (a): filament contrasts; (b): filament widths; (c): logarithmic slope of profile; (d): dust temperatures along the filament crests; (e): surface densities along the crest; (f): ratio of linear density to the critical value. The red dashed line indicates the median value, and the error is the rms of the data.