Looking through as many SP-D images as I could find in the literature I began to sense that the distribution (radial) of SP-D dimers was not random. I am determining the angle of separation of each arm of a SP-D fuzzyball to see if the numbers fall into classes of small, and larger. The data for these three pictures is spot-on.  Various authors are responsible for these electron micrographs, i give them credit..they are not my personal photos. Images on the right and left are shadowed, image in the middle is AFM.

To create the round “generalizations” of angles in SP-D fuzzyballs, the actual angles were measured in the molecules below.  A mean was obtained for each angle-set: e.g. the center pix had 4 measurements, as follows:  I will measure all 90 images and see if the trend holds.
147.46
127.6
41.62
43.32