Upper panel: spectral energy distribution (SED) of the southwestern side of Puppis A, with the corresponding best-fit model and its uncertainties at 68% confidence level (green curves and shaded region). Fermi upper limits are at the 95% confidence level. Statistical and systematic errors are indicated in blue and red, respectively. Systematics errors for the Fermi upper limits represent the extrema. Bottom panel: same as the upper panel for the northeastern side.