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\subsection{}   We use our method to measure pumping behavior for animals at no food to high food levels (OD$_{600}$ 0.0 and 4.0). The distribution of instantaneous pumping rates looks bimodal, with a peak at lower frequencies and a peak at higher frequencies Fig.  (\ref{fig:results}A). The animals modulate their feeding behavior in the chips in response to the flow speed. When no food is present, the animals have a non-zero pumping rate as previously reported (Avery? Horvitz, Fig.  \ref{fig:results}B). The mean rates for high food are comparable to the previously reported maximum pumping rates, between 3-4 Hz.