Distribution of the C¹⁸O (black) and ¹²CO (red) (1–0) line along the positions of the Filfinder skeleton. The dotted line shows the v_lsr of the cloud, which is adopted from the N₂H⁺ peak velocity. The spatial positions of the profiles are shown with filled white boxes in the 250 μm Herschel image (upper right corner) from 1–30, starting from extreme south toward the west along the filament. The protostar L1157-mm and clump C2 are marked by black and white arrows, respectively. The integrated intensity contours of C¹⁸ O (1–0) shown in red are obtained by summing the flux over velocity intervals from 2.2–3.0 km s⁻¹. The contours start from 6σ with intervals of 4σ, where σ ~ 0.019 K km s⁻¹. The cyancontours show the blueshifted (toward the north) and redshifted lobe (towards the south) of the bipolar outflow. The levels for the blueshifted lobe range from 0.12–0.5 in steps of 0.08 K km s⁻¹, and for the redshifted lobe, they are in range of 3.9–6.9 K km s⁻¹ in intervals of 1 K km s⁻¹. The ¹²CO line was integrated from −2.2 to +2.3 km s⁻¹ for the high-velocity wings in the southern lobe and from 3.0 to 3.9 km s⁻¹ in the northern lobe.