tokens: We wish to thank the anonymous referee for the extremely useful comments. Based on data products from observations made with ESO Telescopes at the La Silla Paranal Observatory under programme ID 188.B-3002. This work was partly supported by the European Union FP7 programme through ERC grant number 320360 and by the Leverhulme Trust through grant RPG-2012-541. We acknowledge the support from INAF and Ministero dell’Istruzione, dell’Università e della Ricerca (MIUR) in the form of the grant “Premiale VLT 2012”. The results presented here benefit from discussions held during the Gaia -ESO workshops and conferences supported by the ESF (European Science Foundation) through the GREAT Research Network Programme. We wish to thank C. Bailer-Jones and C. Babusiaux for extremely useful comments. M. Schultheis, A. Recio-Blanco, P. de Laverny, and V. Hill acknowledge the support of the “Programme National de Cosmologie et Galaxies” (PNCG) of CNRS/INSU, France. T.B. is funded by grant No. 621-2009- 3911 from the Swedish Research Council.
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