Spectral slope vs. geometric albedo for resonant (left), and scattered disk and detached objects (right). Regions delineated with dashed and dash-dotted lines correspond to the 1 σ contours of the clusters identified in our analysis using the original and full samples, respectively. Filled circles and stars mark plutinos (3:2 resonance) and other resonant objects, respectively, in the left panel. Filled squares and triangles indicate scattered disk and detached objects in the right panel. Black symbols indicate objects with ambiguous cluster assignments.