Perspective view of the 3D clustering results in method B. The color-coding is the same as in Fig. 4. Different colors correspond to different taxonomy classification memberships for C (blue), D (orange red), K (yellow), L (lime), S (red), V (lime green), X (purple), and unassigned (black). The overlapping members of each type in the 2D plane seem to be separated by relatively clear boundaries in 3D space.