Unveiling the remarkable photodissociation region of Messier 8 M. Tiwari, K. M. Menten, F. Wyrowski, J. P. Pérez-Beaupuits, H. Wiesemeyer, R. Güsten, B. Klein and C. Henkel A&A, 615 (2018) A158 Published online: 31 July 2018 DOI: 10.1051/0004-6361/201732437