Effects of the selection function on metallicity trends in spectroscopic surveys of the Milky WayG. Nandakumar, M. Schultheis, M. Hayden, A. Rojas-Arriagada, G. Kordopatis and M. HaywoodA&A, 606 (2017) A97DOI: https://doi.org/10.1051/0004-6361/201731099