Song measurements Principal component Principal component Principal component
PC1 PC2 PC3
Duration (s) 0.82* 0.25 -0.09
Minimum frequency (kHz) -0.26 0.78* 0.24
Maximum frequency (kHz) 0.55 -0.58* 0.30
Frequency of maximum amplitude (kHz) 0.11 0.09 0.93*
Number of elements (n) 0.71* 0.43 -0.18