Torque acting on discs with different Ṁ and metallicity, with 5 × 10-8 M⊙/yr and 0.001 metallicity (top) and 1 × 10-8 M⊙/yr and 0.001 metallicity (bottom). The black lines encircle the regions of outward migration. The vertical red (top) and blue (bottom) lines indicate the ice line at 170 K. The migration maps correspond to the disc profiles shown in Fig. 5. Please note the different colour scale for the bottom plot.
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