The three emission episodes indicated as blue squares in the E_peak,rest–E_iso plane. The black square shows the “summed” position of GRB 091024, obtained using time-integrated quantities (see text for details). Red triangles indicate long GBM GRBs as presented in Amati (2010) together with the best fit to this data (dashed red line). The black solid line shows the best-fit power-law, known as the “Amati relation” together with the  ± 2σ c.l. region (Amati et al. 2008).