Ellipticity of truth GRMHD models (blurred with 12 μas Gaussian) for different GRMHD parameters. All 299 models are shown in blue, and the models that pass the jet power criteria are shown in orange (note that while plotting we combined the nonthermal models with the same parameters but different nonthermal emission fraction (ϵ)). The over-plotting on the histograms shows the median value and the 68% confidence interval. The ellipticity of M87 is shown as a dashed green line, with its error range shown in the shaded green region. In the top rightmost panel, the ellipticity of the critical curve for a Kerr black hole (see Figure 7, Johnson et al. 2020) for different spins (inclination = 17^°) is plotted to compare it with the histograms of the respective spins. The spin = 0.5 case is shown by dashed black line; the spin = +0.94 is represented by a solid black line and the spin = +0.999 case is given by a dotted black line.