Neutrino fluxes predicted by the standard solar models (see Sect. 3) with different chemical mixtures. The comparison to the observational fluxes derived by B16 is shown in the left panels, and to the Borexino Collaboration in the right panel. Left upper panel: two boxes are inserted to present a zoom on the Φ(pp) and P₀ comparisons. In the panel at the bottom, the comparison is restricted to Φ(pp), Φ(Be) and Φ(B) from the B16 set only for the sake of clarity. The 1σ intervals on the observations are shaded in blue in the three panels. The 3σ range is shaded in light blue in the bottom panel.