Graph of the NEODyS non-linear probability density function p(ζ) on the 2185 b-plane (bold curve), whose scale is reported on the left vertical axis. The 2190 keyhole is represented by the vertical line segment, which is located at the keyhole centre ζ_k = −1.333461 × 10⁶ km and whose height is equal to the width w_k = 943 km, with the scale on the right vertical axis. The histogram represents the distribution based on the virtual asteroids of the first MLCS layer from JPL solution 100.