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| The pictures in the figures show the random advection of the dye downstream of the injection point(for about three integral scales). Dye is passively transported by the flow, as odours are. Odour detection events correspond to encounters with dye concentrations above a threshold fixed at about five times the average intensity level. The mean velocity (pointing downward in Fig.3) is about 4cm/s (its measurement by olfactory robots might be realized using standard anemometers ), and the root-mean-square velocity is about 30% of the mean velocity, giving a Reynolds number of ~10^3. Snapshots of the filed are acquired at a frequency of 200Hz. Coherent odour patches make the searcher spiral around the location of the encounters due to correlations among the detections. Yet, the resulting search process is just twice as long as for a model with independent hits, and might be further accelerated by accounting for time-correlations, as detailed in Supplementary Information. |
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