Comparison of the time-resolved E _p − L _{γ, iso} correlation for 15 Fermi GRBs with known redshifts in our sample (marked in color individually) with the time-integrated E _p − L _{γ, iso} correlation for the 101 GRBs in Yonetoku et al. (2010; gray filled circles). The solid line is the best fit to the time-resolved spectra, while the two dotted lines represent its 2σ dispersion around the best fit.