Left: ¹²CO(1–0) velocity field in the Musca cloud from fitting a single gaussian to the ¹²CO(1–0) NANTEN2 data, showing an organised velocity field along the Musca filament. The black line indicates the central axis used to construct the PV diagram in Fig. 23 perpendicular to the Musca filament. The white contours show the high column density region (2 × 10²¹ cm⁻²) in Musca. Right: ¹²CO(1–0) linewidth from the Gaussian fitting to the NANTEN2 data.