Table 2.

The average CA and AUC for all possible combination of the variables in the LeIR data.

Variables				Average CA	Average AUC
δ 2H	δ 18O	δ 13C	δ 15N	55.9%	0.88
δ 2H		δ 13C	δ 15N	55.2%	0.87
	δ 18O	δ 13C	δ 15N	53.3%	0.88
		δ 13C	δ 15N	52.2%	0.87
δ 2H	δ 18O		δ 15N	45.1%	0.84
	δ 18O		δ 15N	42.8%	0.83
δ 2H			δ 15N	36.8%	0.83
δ 2H		δ 13C		35.8%	0.78
δ 2H	δ 18O	δ 13C		35.0%	0.78
	δ 18O	δ 13C		33.9%	0.78
		δ 13C		31.4%	0.75
			δ 15N	30.7%	0.82
δ 2H	δ 18O			23.5%	0.67
	δ 18O			23.0%	0.63
δ 2H				19.1%	0.69