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. 2014 Oct 14;9(10):e109334. doi: 10.1371/journal.pone.0109334

Figure 1. Duration and FM of tet and stack calls in 6 pairs (10 randomly selected measurements per animal).

Figure 1

A. Examples of tets and stacks. Clearly, tets are much stronger frequency-modulated than stacks. Note that our wireless microphones show more power in the lower frequencies as compared with external microphones since they record the near field. B. Tet calls had shorter durations than stacks (P = 1.90e–19). In females, duration was slightly longer than in males (P = 0.0025). C. Tets had higher FM-scores than stacks (P = 0.0001) whereas FM-scores were generally lowest in females (P = 0.0003). All tests: REML in JMP10 with pairs as random factor. Pitch was not different between tets and stacks (not shown).