Positional changes of selected agent bees on arrival of the wave front. (a-d) Time courses of positional coordinates of the thoraces of 605 agent bees during two shimmering waves (900 frames). Time zero is defined by the arrival time of the wave at an individual agent; black curves represent arithmetic means; vertical bars, s.e.m.; colours show x-deflection (orange), y-deflection (blue), z-deflection (red) and rRS-values (violet); the positional (Δx, Δy, Δz) directions and the assessment of the rRS value by movement detection (md, see Figure 7) are defined in the schematics on the top. The waves were sorted regarding ten RS-levels, which consecutively were arranged in three groups, "high" (a-d, e-h; upper rows of charts), "middle" (middle rows) and "low" (bottom rows); the respective areas of rRS are shown on the right ordinate of a-d by the full rectangles of three different shadings of violet (nhigh = 725; nmiddle = 2571; nlow = 1471 episodes); see Figure 9a for the detailed distribution of the rRS values. (e-g, see black-coloured ordinates on the left), correlations between the positional coordinates of agent bees (a-c) and rRS (d) over time. (h, see red-coloured ordinates on the right), correlations between the Δx- (a) and Δz-coordinates (c) over time, the arithmetic means are black in (h). (i-l), time courses of the positional components and rRS for the middle (means only, thin curves) and high (means ± s.e.m., thicker curves) range; amplified time scale; the arrival of the wave is marked by thick (high rRS range) and thin (middle rRS range) arrows. Note that the curves start in the pre-trigger period with slightly negative trends (white arrows at the left), 0.3-0.4 s before the waves arrived (black arrows in the rRS curves) at the agent bees.