Moment 1 map of ¹²CO in Sz 65 (top) and Sz 66 (bottom). Contours show the surface brightness in the moment 0 map at (3, 15, 30) × σ_CO, where σ_CO =1.3 mJybeam⁻¹ km s⁻¹. Both maps were created using emission in the cube above a threshold of 3σ. The Sz 66 field is visibly noisier because it is found towards the edge of the primary beam in the observations that were centred on Sz 65.