Figure 2.

Estimated distribution of forward reachable path (FRP) evolution over a 5-year period for casual and one-time sexual partnership networks of MSM in San Francisco and Atlanta. Each line represents the trajectory of connectivity in the network over time, for a specific node from time 0. Casual partnerships are defined as an ongoing relationship, but not a main partner, and one-time as partnerships are those without duration, occurring only once. The number connected, or reachable within the network, is on the Y-axis and the time step in weeks is the X-axis.