The estimate and 95% CIs of the exponents β and coefficients a (in units of mm s^{−1}) associated with the power-law relationship 〈v(T)〉_{t}=aT^{β} for the three investigated colonies in each of the two treatments, no cleaning (NC) and cleaning (C). (The values are based on a linear regression fitted to the log–log relationship between average event speed and event duration.)