Distribution of the GRB detected by HERMES (for the case of Constellation B, blue contours) in the plane E_peak–peak flux (10–1000 keV) compared with the distribution of real Fermi/GBM GRBs (red dashed contours). Contour levels show the regions containing 68%, 95%, and 99% of the GRBs. Green contours show the HERMES GRBs detected only by the X mode. The black contour refers to the whole simulated population. Left: Long GRB. Right: Short GRBs.