Observational signatures of past mass-exchange episodes in massive binaries: the case of LSS 3074 F. Raucq, E. Gosset, G. Rauw, J. Manfroid, L. Mahy, N. Mennekens and D. Vanbeveren A&A, 601 (2017) A133 Published online: 23 May 2017 DOI: 10.1051/0004-6361/201630330