Spectral energy distributions of GRB 090926A in time intervals c (top panels) and d (lower panels) from the joint GBM/LAT analysis using LAT Pass 8 above 30 MeV. The solid curve represents the Band + CUTBPL model (left column) and the ISSM + CUTBPL model (right column), within a 68% confidence level contour derived from the errors on the fit parameters. The reference energy of the CUTBPL was fixed to 10 MeV like in Y17.