Evolution of H/r in the disc for the different stages. The disc features Ṁ = 2 × 10-7 M⊙/yr. At the beginning, in the (H/r)0 stage, α0 = 0.001, which we change to α1 = 0.003 after the stage (H/r)1 is reached. The stage (H/r)2 shows the aspect ratio after the viscosity has change and (H/r)final shows the final stage after the surface density has been re-arranged.
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