Measurement of the average shape of longitudinal profiles of cosmic-ray air showers at the Pierre Auger Observatory - Aab, A.; Albuquerque, Ivone Freire da Mota e; Catalani, Fernando; Souza, Vitor de; Kemmerich, Nikolas; Lang, R. G.; Prado, Raul Ribeiro; Carvalho Junior, Washington Rodrigues de; Santos, Edivaldo Moura; Peixoto, Carlos Jose Todero (Journal of Cosmology and Astroparticle Physics, 2019)