Top panel: observed peak energy Ep vs. the power-law index α of the PDS (15−150 keV) for a sample of GRBs with known redshift and well-constrained time–averaged energy spectrum. The shaded area highlights the BAT energy passband. Bottom panel: same plot in the intrinsic plane, i.e. where the peak energy Ep,i refers to the GRB comoving frame. Circles (triangles) correspond to pl (bpl) model. Median errors are shown (top right). The dashed line shows the case α = 2.
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