The equation of state for two flavor QCD at N_t=6
  We calculate the two flavor equation of state for QCD on lattices with lattice spacing a=(6T)^{-1} and find that cutoff effects are substantially reduced compared to an earlier study using a=(4T)^{-1}. However, it is likely that significant cutoff effects remain. We fit the lattice data to expected forms of the free energy density for a second order phase transition at zero-quark-mass, which allows us to extrapolate the equation of state to m_q=0 and to extract the speed of sound. We find that the equation of state depends weakly on the quark mass for small quark mass. 
The MILC Collaboration: C. W. Bernard, T. Blum, C. Detar, S. Gottlieb,   U. M. Heller, J. E. Hetrick, L. Karkkainen, R. Rumm...