Decoherence lifetime as a function of the semi-major axis and eccentricity with an inclination of 0° using D_{S H} (a), D′ (b), or D_H (c) values in conjunction with a DBSCAN algorithm to determine clustering. The ϵ value for the DBSCAN algorithm was chosen to where the “kink” is in the cumulative D-value distributions for NEOs (Fig. 13). Also, core points have at least 2 connections. The decoherence lifetime was thus defined as when the fictitious meteoroid stream lost 95% or more of the original stream mass.