Lattice QCD ensembles with four flavors of highly improved staggered quarks

A. Bazavov, C. Bernard, J. Komijani, C. Detar, L. Levkova, W. Freeman, Steven Gottlieb, Ran Zhou, U. M. Heller, J. E. Hetrick, J. Laiho, J. Osborn, R. L. Sugar, D. Toussaint, R. S. Van De Water