Chemical (in)homogeneity and atomic diffusion in the open cluster M 67 F. Liu, M. Asplund, D. Yong, S. Feltzing, A. Dotter, J. Meléndez and I. Ramírez A&A, 627 (2019) A117 Published online: 10 July 2019 DOI: 10.1051/0004-6361/201935306