Position-velocity diagrams for the four tracers from left to right: HISA, ¹³CO(1–0), [CI], and ¹³CO(3–2). The cutsare in a north–south direction along the lines shown in Figs. 6 ([CI], ¹³CO(3–2)) and 10 (HISA, ¹³CO(1–0)). Both axes have a slightly larger extent for the HISA and ¹³CO(1–0) data compared to the [CI] and ¹³CO(3–2) cuts. The approximate location of the center of the filament is marked in all panels.