Curve fitting methods of Aggregated Contact Duration. This figure shows the four piece-wise fitting approaches for aggregated contact duration over a CCDF plot of the empirical data. Points represented by a (+) are indicative of the empirical probability of a contact duration. The solid red line corresponds to the two-piece power law-exponential distribution fit. The solid green line corresponds to the three-piece power law-exponential-exponential distribution fit. Text in blue or red corresponds to the break points for each fit section. Outliers (at the head and tail) not included in either fit are included in the SW3PTT case.