Bright C2H emission in protoplanetary discs in Lupus: high volatile C/O > 1 ratios A. Miotello, S. Facchini, E. F. van Dishoeck, P. Cazzoletti, L. Testi, J. P. Williams, M. Ansdell, S. van Terwisga and N. van der Marel A&A, 631 (2019) A69 Published online: 22 October 2019 DOI: 10.1051/0004-6361/201935441