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Colony radius, r, against time, t, since growth inception (see text) for C = 0.15–0.4%, as shown. (Inset) Linear fit to the raw radial data for C = 0.3% against time since inoculation, ti. Similar fits for all other concentrations define the migration speed (slope) and the latency time, (intersection with the time axis). Error bars are at most the size of a data point.
