Properties of the γ-ray emission for Run 1, the base case scenario of a shock propagating in a wind. Top panel: time-averaged spectrum over the first 15 days; the dashed (dot-dashed) curve is the inverse-Compton scattering on the red giant (nova) photons. Middle panel: light curves in the 100 MeV−100 GeV band; the collective upper limit on the flux from day 19 to 33 is 0.8  × 10^-7 ph cm s (not shown for simplicity). Bottom panel: non-thermal energy in particles and cumulated radiation; the red and blue solid (dashed) curves correspond to particles (radiation); the black solid (dashed) curve is the total non-thermal energy (initial nova kinetic energy).