Evolution of Hubble function H(z) with redshift z. Comparison between OHD (purple points with error bars; 0 < z < 2.36) and theoretical predictions. The solid red and green lines corresponds to the ΛCDM and ΛCDM + Ω_K models, respectively. The dashed, dash-dotted, and dotted lines correspond to the ΛvCDM and ΛvCDM + Ω_K models. The parameters constrained by the Base 2 + CC + R22 dataset.