Correlations between filament properties, (a) Filament crest column density against column density contrast. The blue solid line is the fit: ${\mathrm{\hspace{0.17em}log}}_{10}\left(N_{{\text{H}}_2}\right)=1.06{\mathrm{\hspace{0.17em}log}}_{10}C+21.18$. (b) Filament line mass ($M_{\text{line }}^{\text{M}}=M_{\text{fil}}/L_{\text{fil}}$) versus column density contrast, well represented by the fit ${\mathrm{\hspace{0.17em}log}}_{10}{M}_{\text{line }}^{\text{M}}=1.38{\mathrm{\hspace{0.17em}log}}_{10}C+1.14$ (blue solid line), (c) $M_{\text{line}}^{\text{M}}$ estimate against $M_{\text{line}}^{\text{P}}$ estimate of filament line mass (see text). The blue solid line is the fit: ${\mathrm{\hspace{0.17em}log}}_{10}{M}_{\text{line }}^{\text{p}}=0.89{\mathrm{\hspace{0.17em}log}}_{10}{M}_{\text{line }}^{\text{M}}-0.05$. (d) Filament crest temperature versus filament line mass $M_{\text{line }}^{\text{M}}$. The blue solid line represents the relation: $T=\mathrm{-1.29}{\text{\hspace{0.17em}log}}_{10}{M}_{\text{line}}^{\text{M}}+16.44$.