Table 4.

Mean values of angles—triangulation I

	Pan		Gorilla		Pongo
	Male (28)	Female (26)	Male (29)	Female (30)	Male (30)	Female (24)
θ1	0.0301	0.0365	0.0947	0.0406	0.1446	1.3070
θ2	0.2727	0.3018	0.2917	0.2910	0.3472	0.3644
θ3	0.5202	0.4929	0.4229	0.4850	0.2585	0.3332
ψ1	3.0752	3.0607	2.9249	3.0457	2.8417	2.8627
ψ2	2.3262	2.2674	2.1789	2.2715	2.0500	2.0980
ψ3	0.3429	0.3164	0.3094	0.3416	0.2079	0.2202