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Extracted Arnol'd tongues. Start (>) and end points (<) of synchronization as automatically detected from the frequency sweep synchrograms. For the 1 : 1 lockings, we show linear fits of the boundaries of the tongue (robust fits, forced through [1,0]). From the control experiments with flies whose haltere endknobs were ablated, we obtained only two lockings (filled triangles) with markedly reduced width.
