Imaging the water snowline in a protostellar envelope with H13CO+ Merel L. R. van ’t Hoff, Magnus V. Persson, Daniel Harsono, Vianney Taquet, Jes K. Jørgensen, Ruud Visser, Edwin A. Bergin and Ewine F. van Dishoeck A&A, 613 (2018) A29 Published online: 28 May 2018 DOI: 10.1051/0004-6361/201731656