tokens: We thank Nicolas Bouché, Max Pettini and Crystal Martin for inputs on the work presented here. We also thank the anonymous referee for many suggestions that have improved the paper. We would like to thank the Paranal and Garching staff at ESO for performing the observations in service mode and the instrument team for making a reliable instrument. CP thanks the ESO science visitor programme for support. SQ thanks CNRS and CNES (Centre National d'Etudes Spatiales) for support for his PhD. VPK acknowledges partial support from the US National Science Foundation grant AST/1108830 and NASA grant NNX14AG74G. Additional support from a NASA/STScI grant for programme 13733 is gratefully acknowledged. This work has been carried out thanks to the support of the OCEVU Labex (ANR-11-LABX-0060) and the A*MIDEX project (ANR-11-IDEX-0001-02) funded by the ‘Investissements d'Avenir’ French government programme managed by the ANR. L. A. S. acknowledges support from ERC Grant agreement 278594-GasAroundGalaxies.
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