Our best hadronic model, H3, of the broadband spectrum of the SNR W44 superimposed with radio (data points in green color) and gamma-ray data of Fig. 1 (in blue and cyan color). Proton distribution in Eq. (3) with index p₁ = 2.2 ± 0.1 (for E < E_br) and p₂ = 3.2 ± 0.1 (for E>E_br) where GeV. This model is characterized by B = 210 μG and n = 300 cm^-3. The yellow curve shows the neutral pion emission from the accelerated proton distribution discussed in the text. The black curves show the electron contribution by synchrotron (dot) and bremsstrahlung (dashed) emissions; the IC contribution is negligible. The red curve shows the total gamma-ray emission from pion-decay and bremsstrahlung. Left panel: SED from radio to gamma-ray band. Right panel: only gamma-ray part of the spectrum.