Table 6: Parameters of the linear fits, weighted with errors, of the age and metallicities (measured in different index-index diagrams indicated between brackets) and the central velocity dispersion. The table shows the results for the central values ($a_{\rm c}$ and $b_{\rm c}$) and for the global values ($a_{\rm g}$ and $b_{\rm g}$). The coefficients a and b represent the zero point and the slope of the linear fit, respectively. The last column shows the t parameter obtained in a t-test to check the hypothesis $b_{\rm c}=b_{\rm g}$. A value of t higher than 2.326 allows us to reject the hypothesis with a significance level lower than 0.01.
  Central Global  
  $a_{\rm c}$ $b_{\rm c}$ $a_{\rm g}$ $b_{\rm g}$ t
[M/H] (CN2-H$\beta $) $0.335\pm 0.081$ $ 0.00037\pm 0.00034$ $ -0.012\pm 0.091$ $ 0.00080\pm 0.00038$ 0.86
[M/H] (Fe4383-H$\beta $) $0.148\pm 0.064$ $ -0.00050\pm 0.00030$ $ -0.275\pm 0.226$ $ 0.00041\pm 0.00087$ 0.98
[M/H] (Mgb-H$\beta $) $0.113\pm 0.075$ $ 0.00112\pm 0.00031$ $ -0.427\pm 0.286$ $ 0.00212\pm 0.00107$ 0.88
log age $9.534\pm 0.075$ $ 0.00177\pm 0.00033$ $ 9.950\pm 0.115$ $ 0.00007\pm 0.00049$ 2.88

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