Extended Data Figure 3: The spectral energy distribution of high energy neutrinos—the counterparts of diffuse γ-rays from the Galactic Centre.
From: Acceleration of petaelectronvolt protons in the Galactic Centre

The energy spectrum of parent protons is derived from the γ-ray data. The three curves correspond to different values of the exponential cut-off in the proton spectrum: 1 PeV, 10 PeV and 100 PeV.