Combined spectra of the PWN HESS J1825-137 with the spectral measurements obtained in this work (red points) using 11.6 years of Fermi-LAT data from 1 GeV to 1 TeV and the H.E.S.S. results for the 100 GeV–90 TeV energy range (black points). The Fermi-LAT flux points were obtained doing a spectral analysis in the various energy bands with their relative spatial model. The combined SED has been fitted with both a LogParabola (blue line) and a Broken PL (green line). The vertical line corresponds to the energy break E_b of the Broken PL model. The bottom panel shows the normalised residual between the data and the LogParabola model.