2D histogram representing the percent relative errors found in the testing dataset. The horizontal axis shows the best-fit errors, and the vertical axis shows the confidence line error. The colors represent the density of points. Yellow indicates the highest-density zones, and purple shows the lowest-density zones. The mean values of the distributions are μ_confidence = 4% and μ_{best − fit} = 8%. The red dots indicate samples from the different regions of the distribution that are visualized in the next figure.