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Fig. 3
Radial torque density in units of (dΓ/dm)0 (see Eq. (11)) at 30 and 200 Torb for the 2D standard model. The torque enhancement and spike near r = 1 at t = 30 Torb is due to the unsaturated corotation torque. At later times, here shown at t = 200 Torb, only the Lindblad contributions due to the spiral arms remain.
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