Correlations between IMF slope and velocity dispersion (left), and metallicity (right). Points are color-coded as in Figure 6, with darker red in the center. Diamonds refer to NGC3309 and stars to NGC3311. On the left, the dashed line indicates the linear fit to the NGC3311 points and the dotted–dashed line the fit to those of NGC3309; on the right, the dashed line refers to the global linear fit.