Structure of the computational grid over the whole domain, illustrated for a rest mass density slice along the plane containing the star and jet center. The density scale extends from 10⁻¹⁹ (deep blue) to 10⁻¹² g cm⁻³ (red), same as Fig. 3. The grid contains five refinement levels: the whole domain is refined twice (green and blue interfaces) by a factor of 4 and then twice more (cyan and magenta interfaces) by a factor of 2 to attain a factor of 64 in the finest levels, which are better shown in the zoom into the jet injection at the orbital scale in the bottom right corner of the image.