Fourier fits to the ring azimuthal profile in the µ = 0.003, R = 25 m simulation at T = 250 000 (same simulation as in Fig. 6). The uppermost frame shows r(L) profile, with a |m| = 1 fit superposed. The second frame shows the residual profile after subtracting the |m| = 1 component; the green curve is the |m| = 2 fit to the residual profile. The next frames repeat the procedure for |m| = 3 and |m| = 4.