Bolometric flux vs. E_max for the GRBs in Sample-1. Each entry in the plot represents a spectrum of Sample-1. The best-fitted models (Model-1 or Model-2) of the individual spectrum are indicated with different markers. The colour bar indicates the corresponding spectral index for each spectrum (represented by each point in the graph) in the high-energy gamma-rays detected with LAT. The highest-energy photons are represented in the co-moving frame. For each spectrum the corresponding LAT photon index in the energy range 0.1–10 GeV is indicated by a colour gradient.