Table 2: Physical parameters of BA09 obtained by BBL91 (with upper limit errors) and in this work. Our errors are formal fitting errors followed by a more realistic estimate of possible systematic errors.
BBL91 This work

$T_{\rm eff}$ (K) 32 500 $\pm$ 6700 29 446 $\pm$ 81 $\pm$ 500

$\log g$ 6.00 $\pm$ 0.69 5.33 $\pm$ 0.02 $\pm$ 0.10

$\log n$ (He)/n(H) <-2.00 -2.54 $\pm$ 0.03 $\pm$ 0.20

**Table 2:** Physical parameters of BA09 obtained by BBL91 (with upper limit errors) and in this work. Our errors are formal fitting errors followed by a more realistic estimate of possible systematic errors.
	BBL91	This work
$T_{\rm eff}$ (K)	32 500 $\pm$ 6700	29 446 $\pm$ 81 $\pm$ 500
$\log g$	6.00 $\pm$ 0.69	5.33 $\pm$ 0.02 $\pm$ 0.10
$\log n$ (He)/n(H)	<-2.00	-2.54 $\pm$ 0.03 $\pm$ 0.20

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