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Fig. 3. Burst period (BP) and its coefficient of variance as a function of concentration (N=6). (A) We measured the BP and counted the number of bursts from 2 to 5 min after OA application. (B) A significant increase in the frequency of burst activity was observed for OA concentrations in the range from 10–6 mol l–1 to 10–4 mol l–1. The coefficient of variation (the square root of BP variance divided by its mean) was small during fictive locomotion. Solid circles, burst frequency; open circles, coefficient of variance.