Radial flux of angular momentum as a function of radius after averaging in (θ,φ) and over time from 1136t_in to 1200t_in in run M3T10R10: total stress (solid black), gravitational stress α_G (dashed blue), magnetic stress α_M (dot-dashed red), and hydrodynamic stress α_R (dotted green). The thin horizontal line at α = 10⁻¹ corresponds to local thermal balance of viscous heating versus cooling.