X vs. galactocentric distance projections of a subset of the Halo-02 sample for the unperturbed sample clustered with OPTICS (left), one of the perturbed samples with Gaia-like uncertainties clustered with FOPTICS (middle), and one of the perturbed sampled with five times the Gaia uncertainties also clustered with FOPTICS (right). The extracted clusters in each case were color coded to match their respective reachability diagrams (Figs. 10, 13 and 14, respectively).