Spectral energy distribution of gamma rays from PSR B1259–63/LS 2883. Left: results obtained from the observation campaign in 2014, with two different instrument configurations: CT5 mono and CT1–5 stereo, shown in red and blue, respectively. Right: results from observation campaigns in 2004, 2007, 2011 and 2014 in CT1–4 stereo mode. Spectral energy bins are defined such that flux points have a statistical significance above 2σ in all cases. The highest-energy flux point of the 2014 spectrum is significant at the 1.5σ level only. Upper panels: best power-law fit to the data, with coloured bands indicating the 1σ statistical uncertainties on these fits. Lower panels: residuals of actual data to the best spectral fit. See main text for details.