Fig. 2.

A sampling of cumulative three-dimensional locations of individuals detected in each swarm. All positions are given in meters relative to the swarm centroid at the moment of detection to control for the effect of camera movement. Colors indicate the natural logarithm of the distance to nearest neighbor (DNN): red = closer, blue = further (scale is consistent between panels). Axis orientation relative to camera position is as follows: y = vertical axis, x = horizontal, left/right, and z = horizontal, distance from the camera. (a and b) Swarms of the S molecular form. (c and d) M form swarms. Note that the swarm represented in b was filmed durng conditions of high wind, which might explain the atypically horizontally elongated swarm shape.