Table 6: H$\beta $ corrections for gradients.
Galaxy aperture EWO[III] Quality EWH$\alpha $
NGC 3607 0 -0.369 1.000 -0.608
NGC 3607 1 -0.183 0.000 -0.445
NGC 3607 2 -0.263 1.000 -0.434
NGC 3607 3 0.117 0.000 -0.129
NGC 3818 0 -0.1947 0.000 -0.135
NGC 3818 1 -0.220 1.000 -0.153
NGC 3818 2 -0.352 1.000 -0.251
NGC 3818 3 -0.211 0.000 -0.428
.... ... ..... ..... .....
The table provides the object identification (Col. 1), the number of the gradient (column 2) ( $0=0 \leq r \leq r_{\rm e}$/16, $1 = r_{\rm e}$/ $16 \leq r \leq r_{\rm e}$/8, $2 = r_{\rm e}$/ $8 \leq r \leq r_{\rm e}$/4 and $3 = r_{\rm e}$/ $4 \leq r \leq r_{\rm e}$/2), and the EW of H$\beta $ emission as derived from the O[III] and H$\alpha $ emissions (Cols. 3 and 5 respectively). Column 4 gives the quality of the measure, obtained as the ratio between the estimated emission ( $F_{\rm gal} - F_{\rm templ}$) and the variance of the spectrum in the O[III] wavelength region, $\sigma_\lambda$. When the emission is lower than the variance, the quality is set to 0. When the emission is between 1 and 2 $\sigma_\lambda$ or larger than 2  $\sigma_\lambda$, the quality is set to 1 and 2 respectively. The entire table is given in electronic form.

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