Left: heating efficiency–equilibrium temperature (HEET) posterior distribution under the linear-uniform prior using a Gaussian function and a 4th degree polynomial. Right: the Gaussian function shown on the left side in comparison to the HEET posterior distribution inferred by TF18. The shaded region show the 68% credible interval. There is a good agreement between the Gaussian and poly models, which shows that indeed the HEET distribution follows a Gaussian function. Our results are in agreement with the findings of TF18 although the peak in our models is shifted to higher equilibrium temperatures.