Current density calculated from the magnetic field extrapolation. The red rectangle in the top panels delimits the embedded SST/CRISP FOV in the extended HMI magnetogram. The middle and lower rows show j²/ρ at different heights in square-root scaling and arbitrary units for qualitative comparison with ALMA T_b contour overlays (cyan lines) within the region delimited by the dashed box. The lower right panel shows j²/ρ averaged over height between z = [1, 4] Mm. The yellow contour indicates |B_z| at z = 0 Mm.