Crests of the identified filamentary structures over-plotted on the Stokes I map. The connected sections from 1 to 4 trace the ridge crest (cf., Figs. 11 and 12). The blue lines from 5 to 14 trace the crests of the sub-filaments. The cyan line traces the crest of a filament connecting the two core-hubs, I and I(N). The black dashed rectangle indicates the hub-filament structure (see Fig. 13). The black dashed ellipse shows the clump-hub. The crosses and circles are the same as in Fig. 1-top-left.