Table 2.

Computed ¹⁸O/¹⁶O ratios for BSA mixed at predetermined ratios of 1:1, 3:1 and 1:3 using different adjustment.

18O:16O	Method	Average ± SD
		Run 1	Run 2	Run 3	All Runs
1:1	Allow f to vary	1.50 ± 1.33	1.41 ± 0.57	1.24 ± 0.58	1.38 ± 0.88
	Filtered by f > 0.6	1.27 ± 0.48	1.41 ± 0.57	1.18 ± 0.51	1.29 ± 0.53
	Predetermined f	1.00 ± 0.52	1.18 ± 0.56	1.01 ± 0.47	1.06 ± 0.52
3:1	Allow f to vary	4.15 ± 2.22	3.58 ± 1.56	3.70 ± 1.67	3.80 ± 1.82
	Filtered by f > 0.6	4.26 ± 2.31	3.53 ± 1.39	3.72 ± 1.69	3.83 ± 1.83
	Predetermined f	3.56 ± 5.84	2.68 ± 1.40	3.40 ± 1.96	3.23 ± 3.37
1:3	Allow f to vary	0.52 ± 0.38	0.45 ± 0.25	0.42 ± 0.13	0.47 ± 0.29
	Filtered by f > 0.6	0.42 ± 0.12	0.44 ± 0.26	0.43 ± 0.13	0.43 ± 0.17
	Predetermined f	0.33 ± 0.12	0.34 ± 0.20	0.30 ± 0.15	0.33 ± 0.16