Spectral energy distribution fits to HESS J1646−458, assuming E_min = 100MeV (upper panel) and E_min = 1GeV (lower panel). The data are, from left to right: the Planck radio upper limit in red, the eROSITA X-ray upper confidence bound in orange, the Fermi-LAT HE γ-ray upper limit in blue, and the H.E.S.S. VHE γ-ray data from Aharonian et al. (2022) in purple. The solid orange lines are synchrotron radiation and the solid blue lines are IC scattering. The different target photon contributions to the IC scattering are given by the thin black lines. The CMB is solid, diffuse Galactic infrared radiation dashed, diffuse Galactic optical light dashed-dotted, and Wd 1’s photon field dotted.