Fig. 4.

The figure of merit of Fig. 2, plotted versus $N_{\mathrm{eig}}$ for fixed $\mathit{ϵ}=0.25$ (blue curve), for the NNPDF3.0 NLO set. The optimal value $N_{\mathrm{eig}}=120$ is denoted by a vertical dash. Results obtained by not optimizing the basis through the GA are also shown (red curve)