Table 1: $T_{\rm c}/T_{{\rm eff}}$ ratios in models with $N_{\rm H}/N_{{\rm He}}=0.11$ , and $N_{{\rm Fe}}/N_{\rm H}=10^{-5}$ .
$\log{g}\diagdown T_{{\rm eff}}$ $1\times 10^7$ $1.5\times 10^7$ $2\times 10^7$ $2.5\times 10^7$ $3\times 10^7$

15.0 1.37 1.25 1.30 1.31 1.45

14.9 1.36 1.25 1.31 1.47 1.56

14.8 1.34 1.25 1.32 1.50 1.76

14.7 1.33 1.25 1.35 1.53 -

14.6 1.33 1.26 1.40 1.54 -

14.5 1.32 1.26 1.42 1.68 -

14.4 1.30 1.28 1.42 - -

14.3 1.30 1.29 1.45 - -

14.2 1.30 1.31 1.48 - -

14.1 1.30 1.34 1.67 - -

14.0 1.29 1.38 - - -

13.9 1.29 1.41 - - -

13.8 1.30 1.47 - - -

13.7 1.30 1.77 - - -

13.6 1.30 1.85 - - -

13.5 1.31 - - - -

13.4 1.33 - - - -

13.3 1.34 - - - -

13.2 1.39 - - - -

13.1 1.44 - - - -

13.0 1.50 - - - -

12.9 1.63 - - - -

**Table 1:** $T_{\rm c}/T_{{\rm eff}}$ ratios in models with $N_{\rm H}/N_{{\rm He}}=0.11$ , and $N_{{\rm Fe}}/N_{\rm H}=10^{-5}$ .
$\log{g}\diagdown T_{{\rm eff}}$	$1\times 10^7$	$1.5\times 10^7$	$2\times 10^7$	$2.5\times 10^7$	$3\times 10^7$
15.0	1.37	1.25	1.30	1.31	1.45
14.9	1.36	1.25	1.31	1.47	1.56
14.8	1.34	1.25	1.32	1.50	1.76
14.7	1.33	1.25	1.35	1.53	-
14.6	1.33	1.26	1.40	1.54	-
14.5	1.32	1.26	1.42	1.68	-
14.4	1.30	1.28	1.42	-	-
14.3	1.30	1.29	1.45	-	-
14.2	1.30	1.31	1.48	-	-
14.1	1.30	1.34	1.67	-	-
14.0	1.29	1.38	-	-	-
13.9	1.29	1.41	-	-	-
13.8	1.30	1.47	-	-	-
13.7	1.30	1.77	-	-	-
13.6	1.30	1.85	-	-	-
13.5	1.31	-	-	-	-
13.4	1.33	-	-	-	-
13.3	1.34	-	-	-	-
13.2	1.39	-	-	-	-
13.1	1.44	-	-	-	-
13.0	1.50	-	-	-	-
12.9	1.63	-	-	-	-

Source LaTeX | All tables | In the text

	1 Introduction
	2 Our models - assumptions and equations
	3 Results
	4 Summary and discussion
	Appendix A: The lower boundary condition
	References