Probability density of the close encounters for the pairs 1–2, 1–4, 1–7, 1–324. All approaches closer than 0.01 AU are collected in bins of 0.0001 AU. The number of hits in each bin is plotted versus the distance of closest approach Δ (in AU/1000). The solid line is the linear fit to this data, which provides, after normalization, the probability density function for the close approaches (Table 3).