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Fig. 1. Characteristic unfiltered echo signatures of barn swallows (BS) and house martins (HM) during climbing (BS1, HM1), horizontal (BS2, HM2) and descending (BS3, HM3) flight recorded by tracking radar. The examples show wingbeat patterns for 5 s intervals. Flight angle and mean air speed are given in the upper right corner. Large ticks above each signature indicate time in seconds. For each example, five consecutive flapping cycles are marked (three shaded + two in between).





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