Deconvolved FWHM (W_dec) (panel a) and central dust temperature () (panel b) against central H₂ column density () for the ten selected filaments of Table 1. The error bars correspond to standard deviations. Panel a: thermal Jeans length as a function of column density is shown by green-dotted and blue-dashed lines for gas temperatures of 10 and 15 K, respectively, where and W ~ 0.1 pc. Panel b: a clear anti-correlation between and : (green-dashed line).