Fragment masses against nearest neighbor separation from the minimum spanning tree analysis. The solid line corresponds to the Jeans lengths and Jeans masses calculated at 50 K for a density grid between 10⁵ and 10⁷ cm⁻³. For comparison, the dashed line corresponds to the Jeans lengths and Jeans masses calculated at a fixed density of 5 × 10⁵ cm⁻³ (Beuther et al. 2002) with temperatures between 10 and 100 K. The color coding shows the distances of the sources.