Table 2: Summary of the coefficients relevant to Eq. (1). The coefficients in Cols. 2-8 are given in units of Å. Columns 9-14 are given in dex/Gyr. Note that for the higher-order Balmer indices Col. 5 gives the arithmetic mean of the uncertainties for cool and warm stars (see Tables 3 and 4 in Worthey & Ottaviani 1997).
index $\eta$ $\zeta$ $\gamma$ $\delta$ ${\cal D}_{-1.35}$ ${\cal D}_{0.0}$ $\langle{\cal D}_{\rm Z}\rangle$ ${\cal S}_{0.3,-1.35,3}$ ${\cal S}_{0.3,-1.35,13}$ ${\cal S}_{0.3,0.0,3}$ ${\cal S}_{0.3,0.0,13}$ $\langle{\cal S_{\rm\alpha,Z,t}}\rangle$ $\cal R$

1 2 3 4 5 6 7 8 9 10 11 12 13 14

H $\beta$ 0.20 0.232 0.22 1.30 2.55 2.68 2.62 0.382 0.137 0.408 0.102 0.257 0.497

H $\gamma _{\rm A}$ 0.28 0.722 0.48 1.78 7.75 11.01 9.38 0.283 0.068 0.227 0.036 0.154 0.722

H $\gamma _{\rm F}$ 0.28 0.448 0.33 1.34 4.55 5.83 5.19 0.291 0.072 0.123 0.050 0.134 0.471

H $\delta _{\rm A}$ 0.27 1.043 0.64 1.27 5.73 9.11 7.42 0.259 0.045 0.180 0.032 0.129 0.537

H $\delta _{\rm F}$ 0.28 0.790 0.40 1.18 3.83 4.47 4.15 0.281 0.052 0.114 0.036 0.121 0.334

**Table 2:** Summary of the coefficients relevant to Eq. (1). The coefficients in Cols. 2-8 are given in units of Å. Columns 9-14 are given in dex/Gyr. Note that for the higher-order Balmer indices Col. 5 gives the arithmetic mean of the uncertainties for cool and warm stars (see Tables 3 and 4 in Worthey & Ottaviani 1997).
index	$\eta$	$\zeta$	$\gamma$	$\delta$	${\cal D}_{-1.35}$	${\cal D}_{0.0}$	$\langle{\cal D}_{\rm Z}\rangle$	${\cal S}_{0.3,-1.35,3}$	${\cal S}_{0.3,-1.35,13}$	${\cal S}_{0.3,0.0,3}$	${\cal S}_{0.3,0.0,13}$	$\langle{\cal S_{\rm\alpha,Z,t}}\rangle$	$\cal R$
1	2	3	4	5	6	7	8	9	10	11	12	13	14
H $\beta$	0.20	0.232	0.22	1.30	2.55	2.68	2.62	0.382	0.137	0.408	0.102	0.257	0.497
H $\gamma _{\rm A}$	0.28	0.722	0.48	1.78	7.75	11.01	9.38	0.283	0.068	0.227	0.036	0.154	0.722
H $\gamma _{\rm F}$	0.28	0.448	0.33	1.34	4.55	5.83	5.19	0.291	0.072	0.123	0.050	0.134	0.471
H $\delta _{\rm A}$	0.27	1.043	0.64	1.27	5.73	9.11	7.42	0.259	0.045	0.180	0.032	0.129	0.537
H $\delta _{\rm F}$	0.28	0.790	0.40	1.18	3.83	4.47	4.15	0.281	0.052	0.114	0.036	0.121	0.334

Source LaTeX | All tables | In the text

	1 Introduction
	2 Selection of data
	3 Reducing systematic uncertainties
	4 Ages and metallicities
	5 [ ${\alpha }$ /Fe] ratios
	6 Discussion
	7 Summary and conclusions
	References