Comparing the model predictions for the δv = +1.12 km s⁻¹ channel. Left: original standard model without outer edge (or more precisely: with only the standard Lynden-Bell and Pringle cutoff of η = 1). Middle: same model as left for the H₂+He gas, but a η = 2 edge for the CO gas. Right: both H₂+He and CO gas outer edge with η = 2, i.e. with the resulting strong deviations from Keplerian rotation.