Red line: average density radial profile at t = 4242 in the simulation of case A. Black plain line: fit (Σ_fit) of the average density profile. Green plain line: density background profile (Σ_BG) deduced from the fit. Green dashed line and black dashed lines: average equilibrium density radial profiles reached in the simulations RELAX-1 and RELAX-2, respectively. The grey area shows theoretical positive total torque region considering the reconstructed density profile with the density fit. The position of the inner boundary of this area (R_PT) is indicated by a vertical blue line. The two hatched areas show the buffer zones used in the simulation: the inner and outer regions where physical quantities are damped to the initial power law profile.