... systems[*]
Based on observations collected at the European Southern Observatory, Cerro Paranal, Chile under programme ID P65.N-0281, P66.B-0068, and P67.B-0034. 
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...[*]
ESA Research Fellow. Space Telescope Division of ESA. 
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... functions[*]
A fitting function gives the strength of a specific line index as a function of  $\log g, T_{\rm eff}$, and [Fe/H]. 
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... functions[*]
A response function gives the fractional change of an index as the result of an abundance change of a given element or the total metallicity. 
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... M 31[*]
We derive HBR parameters for globular clusters in M 31 from colour-magnitude diagrams using HST data kindly provided by Michael Rich (GO:6671). 
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...predictions[*]
We note that systematic uncertainties in the fitting functions and effects of emission-line filling are not considered by this exercise. 
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... [MgFe] index[*]
[MgFe] = $\sqrt{{\rm Mg}b\cdot\langle{\rm Fe}\rangle}$, see González (1993). 
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... vector[*]
To illustrate the effect of this procedure we mark objects, which fall off the grid in all diagnostic plots, by double-hatched histogram in the distributions plots in Fig. 7. 
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... age[*]
A population of warm horizontal branch stars remains a potential cause for increased Balmer line strengths. 
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Copyright ESO 2005