(left) Predicted Hubble evolution H(z) as a function of the redshift for the Hu-Sawicki model in the Palatini formalism (Eqs. (5)–(8)). The curves correspond to the best-fit values of Ω_m0 and c₂ discussed in the text. For the sake of comparison, the standard ΛCDM model prediction is also shown. The data points are the measurements of the H(z) given in Stern et al. (2010). (right) Hubble diagram for 580 SNe Ia from the Union2.1 sample (Suzuki et al. 2012). The curves correspond to the best-fit values of Ω_m0 and c₂ displayed in Table 1.