tokens: We thank an anonymous referee for insightful comments that have improved the content and presentation of this paper. D.W.J. and D.Z. acknowledge financial support from NASA LTSA award NNG05GE82G and GALEX grant NNX11AI47G. G.D.L. acknowledges financial support from the European Research Council under European Community’s Seventh Framework Programme (FP7/2007-2013)/ERC grant agreement No. 202781. P.J. acknowledges support by the Swiss National Science Foundation (SNSF).
ner_tags: O O O O O O O O O O O O O O O O O O B-Person O B-Person O O O O B-Organization B-Grant I-Grant I-Grant O B-Telescope B-Grant I-Grant B-Person O O O O O B-Organization I-Organization I-Organization O B-Organization I-Organization B-Grant I-Grant I-Grant B-Grant B-Grant I-Grant I-Grant I-Grant B-Person O O O O B-Organization I-Organization I-Organization I-Organization B-Organization