Gaia Data Release 2 - Photometric content and validation D. W. Evans, M. Riello, F. De Angeli, J. M. Carrasco, P. Montegriffo, C. Fabricius, C. Jordi, L. Palaversa, C. Diener, G. Busso et al. (36 more) A&A, 616 (2018) A4 Published online: 10 August 2018 DOI: 10.1051/0004-6361/201832756