| Acoustic parameter | 1 (ASEC 17845) | 2 (ASEC 17846) | 3 (ASEC 17847) | 4 (ASEC 17894) |
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| Duration of longer syllables (ms) | 485 ± 60* (400−627; 15) | 591 ± 51* (531−727; 15) | 826 ± 98* (611−984; 15) | 672 ± 103* (482−850; 15) |
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| Interval between longer syllables (ms) | 298 ± 18 (268−331; 15) | 224 ± 13 (183−237; 15) | 222 ± 22 (195−254; 15) | 192 ± 24 (154−222; 15) |
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| Duration of shorter syllables (ms) | 14 ± 4 (7−21; 30) | 20 ± 3 (15−23; 20) | 19 ± 2 (12−22; 35) | 27 ± 3 (25−34; 39) |
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| Interval between shorter syllables (ms) | 34 ± 4 (26−41; 25) | 32 ± 2 (26−33; 15) | 27 ± 2 (25−34; 27) | 37 ± 3 (31−41; 24) |
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| Period of longer syllables (ms) | 783 ± 66 (698−925; 15) | 814 ± 50 (746−939; 15) | 1048 ± 110 (819−1232; 15) | 864 ± 117 (646−1064; 15) |
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| Period of shorter syllables (ms) | 46 ± 5 (35−54; 25) | 51 ± 3 (46−55; 15) | 47 ± 2 (40−49; 27) | 63 ± 3 (58−66; 24) |
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| No. of shorter syllables between longer ones | 6 (5−7; 30)** | 4 (3−5; 30)** | 5(4–6; 30)** | 3 (2–3; 15)** |
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| Pulse repetition rate of longer syllables (pulses/s) | 854 ± 31 (792−897; 15) | 844 ± 41 (777−956; 15) | 827 ± 45 (762−892; 15) | 936 ± 41 (851−990; 15) |
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| Pulse repetition rate of shorter syllables (pulses/s) | 745 ± 46 (651−812; 15) | 727 ± 25 (696−788; 15) | 810 ± 57 (730−933; 15) | 857 ± 63 (735−951; 15) |
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| Carrier frequency of longer syllables (Hz) | 9175 ± 638 (8625−10031; 15) | 9713 ± 974 (8719−11250; 15) | 9256 ± 798 (8625−10781; 15) | - |
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| Carrier frequency of shorter syllables (Hz) | 8931 ± 532 (8625−10125; 15) | 10175 ± 1005 (8813−11344; 15) | 9938 ± 840 (8719−11063; 15) | - |
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