Figure 3.

This figure provides examples of subsets in which the dots were randomly selected. Again, the left panels show the location of the subset dots within the full inventory of dots, and the right panels show how the dots in each subset would appear. Note that contour attributes, e.g., orientation, curvature and length, can be seen in the contiguous subsets shown in Fig. 2, but are not present in the randomly chosen subsets shown here.