GRB 090926A spectral energy distributions as measured by the Fermi GBM and LAT in time intervals c(top panel) and d(bottom panel), using LAT Pass7 above 100 MeV, and Pass 8 data above 30 MeV and 100 MeV (see Tables A.3 and A.4 for more details). Each solid curve represents the best-fitted spectral shape (Band+CUTBPL), within a 68% confidence level contour derived from the errors on the fit parameters.