Innermost jet radii displayed as the FWHM/2 of millimeter VLBI cores at 43, 86, and 230 GHz, by utilizing the VLBI core shift. Our GRMHD simulation result (a = 0.9) in the quasi-steady phase (t/t_g = 11,000) is overlaid. Expected positions of submillimeter VLBI cores at 345 and 690 GHz are also indicated with a horizontal dashed line. A color-filled contour of the Lorentz factor Γ (only where ﹩{u}^{r}\gt 0﹩) is shown, as well as β_p = 1 (green solid lines), the jet stagnation surface ﹩{u}^{r}=0﹩ (navy solid line; only inside the PFD funnel), and b²/ρ = 1 (orange solid line). Other components are identical to those in Figure 1, but the BH spin is adjusted. The size of the BH shadow is indicated with the dotted circle with an average radius of ∼5r_g for our reference. See also Figures 5, 12, and 15 for details.