Table 10: Mean [X/Mg] ratios for stars with [Mg/H]<-2.9, corresponding to the yields of the first supernovae. The r.m.s. is the scatter around the mean.

		rms	n
[Na/Mg]	-0.84	0.22	11
[Al/Mg]	-0.33	0.15	13
[Si/Mg]	+0.21	0.14	14
[K/Mg]	-0.14	0.14	13
[Ca/Mg]	+0.06	0.09	14
[Sc/Mg]	-0.17	0.14	14
[Ti/Mg]	-0.01	0.09	14
[Cr/Mg]	-0.63	0.09	14
[Mn/Mg]	-0.65	0.20	14
[Fe/Mg]	-0.21	0.10	14
[Co/Mg]	+0.13	0.17	14
[Ni/Mg]	-0.23	0.13	14
[Zn/Mg]	+0.15	0.19	14