The bimodal [Mg/Fe] versus [Fe/H] bulge sequence as revealed by APOGEE DR14A. Rojas-Arriagada, M. Zoccali, M. Schultheis, A. Recio-Blanco, G. Zasowski, D. Minniti, H. Jönsson and R. E. CohenA&A, 626 (2019) A16DOI: https://doi.org/10.1051/0004-6361/201834126