The SED of γ-ray emission toward W43 for a uniform disk spatial model with a radius of 0.6°, normalized to emissivity per H atom. The distance of 5.5 kpc is used and the masses are derived in Sect. 3. The solid curve represents the spectrum of emissivity per H atom, assuming the energy distribution of protons is the same as the local intestellar spectrum (LIS) (Casandjian 2015). Also plotted are the normalized SEDs of the Cygnus cocoon (Aharonian et al. 2019) and NGC 3603 (Yang & Aharonian 2017).