Table 1.

Summary of the spectro-temporal and temporal structure measurements extracted from various hierarchical levels of duets (Figure 1)

Level of analysis	Duet level	Spectro-temporal measurements (Sp)	Temporal structure measurements (Ts)
Pair	Complete duet (CoD)	Yes	Yes
	Overlapping duet section (OvS)	Yes	Partially
	Overlapping syllable parts (OvP)	Yes
Individual	Female duet phrase		Yes
	Male duet phrase		Yes
	Non-overlapping female syllable parts	Yes
	Non-overlapping male syllable parts	Yes

For detailed descriptions of these measurements, refer to Tables 2 and 3.