The column-density maps with extracted filaments and the R² in the fitting of width measurements. a), c), e): column-density maps containing three types of filaments: filaments in a hub-filament system, the isolated filament and sparse filaments, respectively. b), d), f): R² derived from the fitting of width measurements in the regions shown in the left panels, respectively. All of the three R² distributions are mainly above 0.8.