Table 2: Logarithm of the suitability index, $\log[\kappa]$, - see Eq. (21) - for the study of the age-metallicity degeneracy, computed for different combinations of common line-strength indices in the optical range. For the generation of these numbers we have employed the predictions of Bruzual & Charlot (2001) models, for single stellar populations of 12 Gyr old and solar metallicity. Better diagrams are those for which $\kappa $ are lower. In this sense, and as a guide for the eye, we have boldfaced and underlined the 10% of these numbers with the lowest values.

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