English: 1=Illustration of the triangulation of a selected agent by stereo tracking. The upper row shows image sequences of the left and right camera regarding the wave episodes w1 and w2 of agent 58 (for information about cut size and location, see Figure 6 and 7; for further details about z-movement and abdomen flipping, see Figure 7 and 9); the red crosses in the images mark the thorax of agent 58. The bottom bar chart gives the z-values of the thoracic position of agent 58 in mm; positive values refer to directions away from the comb, negative directions towards the comb. The moving red line in the graph marks the momentary time position. Note that the waves in the episodes w1 and w2 spread from right to left, and that the participation in shimmering of the neighbours of agent 58 varied strongly (1.9 MB, MPG).