Observation of the Galactic Center in the sub-MeV gamma-ray band with an electron-tracking Compton cameraRemoveTomonori Ikeda, Toru Tanimori, Atsushi Takada, Taito Takemura, Kei Yoshikawa, Yuta Nakamura, Ken Onozaka, Mitsuru Abe, and Yoshitaka MizumuraPhys. Rev. D 114, 043026 (2026)
