Gas versus dust sizes of protoplanetary discs: effects of dust evolution L. Trapman, S. Facchini, M. R. Hogerheijde, E. F. van Dishoeck and S. Bruderer A&A, 629 (2019) A79 Published online: 10 September 2019 DOI: 10.1051/0004-6361/201834723