Left: EHV CO (6–5) emission from MMS 5 outflow. The solid blue contours show the CO (6–5) emission integrated from V_LSR = − 91 to −78 km s⁻¹ (blue-shifted EHV range), while the solid red contours show the CO (6–5) emission integrated from V_LSR = 60–75 km s⁻¹ (red-shifted EHV range). The first contour is 3σ, with contourspacing in steps of σ (2.2 K km s⁻¹). The dashed contours show the high-velocity CO (6–5) emission as presented in Fig. 2. The background greyscale image is the NIR (K-band, 2.12 μm) map taken from T08. Right: CO (6–5) spectrum taken at the B1 and R1 positions (see Table 3). The vertical dot-dashed lines show the boundaries of the EHV range, while the dashed line indicates the cloud velocity.