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Fig. 2

image

Left panel: solutions to Eq. (16)for a disc with n = 1.5, initially extending from r = 0.01r0 to r = r0. Solid lines show the evolution of the inner and outer disc radius and dotted lines show several intermediate radii. Right panel: corresponding surface density distribution Σ(r,t)/Σ0 from Eq. (17)for several values of τ.

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