CLASH-VLT: Enhancement of (O/H) in z = 0.35 RX J2248−4431 cluster galaxies B. I. Ciocan, C. Maier, B. L. Ziegler and M. Verdugo A&A, 633 (2020) A139 Published online: 22 January 2020 DOI: 10.1051/0004-6361/201936712