RGB image using ¹²CO(1–0) synthetic observations (red: 0.5–2 km s⁻¹ & blue: −2 to −0.5 km s⁻¹) and ¹³CO(1–0) synthetic observations (green: −0.5 to 0.5 km s⁻¹) of the simulations in Clarke et al. (2018). The white contour encloses the region with integrated C¹⁸O(1–0) brightness >1 K km s⁻¹. This shows that close to the filament the direction of the velocity gradient can change, similar to what is observed in Musca, as a result of turbulent motions.