**Table 5:** Correlation between the gradients of age and metallicity and the central velocity dispersion. The brackets show the different indicators used to calculate the metallicity gradients. The first and the second rows refer to the values calculated using the ten indicators described in Sect. 3. t: t-parameter calculated as the quotient of the slope and its error, computed through Monte Carlo simulations; Pnc: probability of no correlation according to a non-parametric Spearman test.
	N	t	Pnc
grad age	54	-1.736	0.168
grad [M/H]	54	0.810	0.106
grad [M/H] (CN₂-H $\beta$ )	54	1.075	0.789
grad [M/H] (Ca4227-H $\beta$ )	54	0.251	0.986
grad [M/H] (Fe4383-H $\beta$ )	54	1.303	0.244
grad [M/H] (C4668-H $\beta$ )	54	0.026	0.455
grad [M/H] (Mgb-H $\beta$ )	54	0.578	0.934

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