The 1σ confidence regions of Hubble parameter H(z) at redshift region [0,4], for the wCDM (upper left panel), the IwCDM1 (upper right panel), the IwCDM2 (lower left panel), and the IwCDM3 (lower right panel) model, where the data points of H_0.57 and H_2.34 are also marked by diamonds with error bars for comparison. combined (gray filled regions), SALT2 (blue solid lines), and SiFTO (purple dashed lines) denote the results given by the SN(combined)+CMB+GC, the SN(SALT2)+CMB+GC, and the SN(SiFTO)+CMB+GC data, respectively.