Evidence of a lepto-hadronic two-zone emission in flare states E. Aguilar-Ruiz, N. Fraija and A. Galván-Gámez Eur. Phys. J. C, 83 4 (2023) 338 Published online: 27 April 2023 DOI: 10.1140/epjc/s10052-023-11523-w