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Estimated distribution of forward reachable path (FRP) evolution over a 5-year period for main 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. Main partnerships are defined as partners considered a boyfriend, significant other, or life partner. The number connected, or reachable within the network, is on the Y-axis and the time step in weeks is the X-axis.
