Table 2: Slopes of the linear fits (b) and their errors ($\Delta b$) of the different parameters in Fig. 2 with the central velocity dispersion. The left side ofthe table shows the values for the LDEGs, while the right side of the table, the values for the HDEGs. The last two columns show the result of a t-test to verify if the slopes of both subsamples of galaxies are different. In particular, the last column shows the probability that the slopesof HDEGs and LDEGs are different by chance.
  LDEG HDEG    
  b $\Delta b$ b $\Delta b$ t $\alpha$
$\rm [M/H]$ (CN2) 0.00037 0.00034 0.00138 0.00065 1.37 9%
$\rm [M/H]$ (Fe4383) -0.00050 0.00030 0.00085 0.00053 2.21 1%
$\rm [M/H]$ (Mgb) 0.00113 0.00031 0.00077 0.00042 0.69 24%
log (age) 0.00177 0.00033 0.00004 0.00064 2.41 1%

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