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Fig. 7. Time course of changes in the direction of the initial segment. (A,B) The
change of initial heading with experience is shown for individual ants after a
45° switch (A) or a 90° switch (B) between F1 and F2. The trace for
each ant is a smoothed version of the raw headings using a median filter
(window size, three runs). In A and B the upper and lower shaded areas
represent the ranges over which headings are categorised as F1 and F2,
respectively.