What the Milky Way bulge reveals about the initial metallicity gradients in the disc F. Fragkoudi, P. Di Matteo, M. Haywood, S. Khoperskov, A. Gomez, M. Schultheis, F. Combes and B. Semelin A&A, 607 (2017) L4 Published online: 09 November 2017 DOI: 10.1051/0004-6361/201731597