Table 2: Observational data for our selection of extremely metal-poor halo stars; HE 0107-5240 is repeated for completeness.
Object ${\rm [Fe/H]}$ $T_{\rm eff}$ $\log g$ ${\rm [C/Fe]}$ ${\rm [N/Fe]}$ ${\rm [O/Fe]}$ ${\rm ^{12}C/^{13}C}$ Reference

HE 0107-5240 -5.30 5100 2.2 4.0 2.3 2.4 60 Christlieb et al. (2004); Bessell et al. (2004)

CS 22943-037 -4.00 4900 1.5 1.2 2.7 2.0 4 Depagne et al. (2002)

CS 29498-043 -3.75 4400 0.6 1.9 2.3 - 6 Aoki et al. (2002)

CS 22957-027 -3.11 5100 1.9 2.4 1.6 - 8 Aoki et al. (2002)

CS 22892-052 -2.97 4850 1.5 1.1 1.0 0.7 - Norris et al. (1997); Sneden et al. (2003)

CS 31082-001 -2.90 4850 1.5 0.2 <0.2 0.6 <20 Hill et al. (2002)

**Table 2:** Observational data for our selection of extremely metal-poor halo stars; HE 0107-5240 is repeated for completeness.
Object	${\rm [Fe/H]}$	$T_{\rm eff}$	$\log g$	${\rm [C/Fe]}$	${\rm [N/Fe]}$	${\rm [O/Fe]}$	${\rm ^{12}C/^{13}C}$	Reference
HE 0107-5240	-5.30	5100	2.2	4.0	2.3	2.4	60	Christlieb et al. (2004); Bessell et al. (2004)
CS 22943-037	-4.00	4900	1.5	1.2	2.7	2.0	4	Depagne et al. (2002)
CS 29498-043	-3.75	4400	0.6	1.9	2.3	-	6	Aoki et al. (2002)
CS 22957-027	-3.11	5100	1.9	2.4	1.6	-	8	Aoki et al. (2002)
CS 22892-052	-2.97	4850	1.5	1.1	1.0	0.7	-	Norris et al. (1997); Sneden et al. (2003)
CS 31082-001	-2.90	4850	1.5	0.2	<0.2	0.6	<20	Hill et al. (2002)

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