The results for the trace anomaly using the HISQ action for low (a) and high (b) temperatures for lattice sizes with temporal extent and spatial size , from [48]. Also in (b), the HISQ results are compared to the results using p4 fermions, which has an improved behaviour at high temperatures and to the continuum perturbation theory results at 1-loop (solid line) and 2-loop (dashed line) for the trace anomaly. The stout data are the continuum estimates from the data in [19].
