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\textbf{Pumping at low food levels} (A, B)Distribution of the instantaneous pumping rate at low food and higher food concentration (OD600 0.5 and 2.5, respectively). The pumping rates saturates to about 4 Hz at higher levels of food. (C) Pumping rates as a function of food concentration.(D) The duty ratio increases with higher available food. The duty ratio is the ratio of time spent in an 'on' or 'off' state. We define the 'on' state as a continuous stretch of time with pumps that are 250 ms or less apart in time. (E)Duration (E) Duration  of 'on' states. The saturation increases with decreasing food. (F) Duration of the 'off' states. The curves for varying food levels (0.5,1.5,2.5,3.5) overlay nearly completely.