Statistical analysis of all fitted velocity gradients. (a): Velocity gradient vs. the length over which the gradient has been estimated for all sources in the ATOMS survey (red dots) and current LAsMA observation (black plus). The color lines show the freefall velocity gradients for comparison. For the freefall model, yellow, blue, cyan, and green lines denote masses of 5 M_⊙, 500 M_⊙, 5000 M_⊙, and 50 000 M_⊙, respectively. Panels b–d: zoomed maps with lengths <1 pc (small scale), ~ 1–7.5 pc (medium scale), and >7.5 pc (large scale) in panel a.