Figure 3.

Best-fit single-lens parameters for the sample of 224 lensing events: (a) Distribution of event timescale, t_E. The solid curve is a lognormal fit,), $N\propto \mathrm{\text{exp}}\left(-\frac{{\left(\mathrm{\text{log}}\left(t_{\text{E}}\right)-\mu \right)}^2}{2{\sigma }^2}\right)$, with μ = 1.29 (corresponding to 19.5 days) and σ = 0.54; (b) Distribution of impact parameter, u₀ (light-gray). Due to selection favoring the detection of highly magnified faint events over weakly magnified faint events, there are more events at smaller impact parameters. The dark-gray histogram shows the distribution only for unblended (i.e. relatively bright) events, which are distributed more uniformly, as expected.