Espinoza N, Rackham BV, Jordán A, Apai D, López-Morales M, Osip DJ, Grimm SL, Hoeijmakers J, Wilson PA, Bixel A, et al. ACCESS: a featureless optical transmission spectrum for WASP-19b from Magellan/IMACS. \mnras. 2019;482 (2) :2065-2087.