Combined fit of spectrum and composition data as measured by the Pierre Auger Observatory - Aab, A.; Albuquerque, Ivone Freire da Mota e; Souza, Vitor de; Anjos, R. C. dos; Prado, R. R.; Santos, Edivaldo Moura; Peixoto, Carlos Jose Todero (Journal of Cosmology and Astroparticle Physics, 2017)