Fig. 6
From: Community structure based on circular flow in a large-scale transaction network
The IN component (red), GSCC (green), and OUT component (blue) of the TSR transaction network whose layout has been optimized in three-dimensional space. Nodes are aligned in the z direction according to their values of the Helmholtz-Hodge potential; basically, transaction flows are from top to bottom. On the other hand, the x and y coordinates of nodes were determined by the energy minimum principle with a spring-electric model