Properties of NH₂D cores. Left panel: relation of mass of NH₂D cores (virial mass) in G30.7 and their separation (to the nearest neighbor) (upper panel); the ratio between the separation and the critical length scale estimated from Jeans fragmentation (lower panel). Right panel: relation of mass of NH₂D core (virial mass) and formation timescale (upper panel). The ratio between the separation and the critical mass scale estimated from Jeans fragmentation (lower panel). The plots in the right panel share the same labels as in the legend of the left panel. In both upper plots, the cores that have σ_v > 0.85 km s⁻¹ in at least one velocity component is shown as enlarged markers.