Hadron Production in Ultra-relativistic Nuclear Collisions and the QCD   Phase Diagram: an Update
  We summarize our current understanding of the connection between the QCD phase line and the chemical freeze-out curve as deduced from thermal analyses of yields of particles produced in central collisions between relativistic nuclei. 
Peter Braun-Munzinger and Johanna Stachel
nucl-th hep-lat hep-ph