NLTE for APOGEE: simultaneous multi-element NLTE radiative transfer Y. Osorio, C. Allende Prieto, I. Hubeny, Sz. Mészáros and M. Shetrone A&A, 637 (2020) A80 Published online: 19 May 2020 DOI: 10.1051/0004-6361/201937054