Fig. 4. Build-up and decay (shaded area) of cycle velocity (A–C) and cycle frequency (D–F) of thoracic oscillations during stationary flight (A,D; filled squares, N=15), during annoyance buzzing (B,E; filled circles, N=15), and during forager vibrations (C,F; open circles, N=15). Graphs show the means ± s.d. of relative values (percent of the maximum velocity or of the main frequency, MF). Broken lines indicate 95% of maximum.