Column density of run R2ns (top) and run R2hsink (bottom). These runs are identical to the reference run R2 but R2ns has no sink particle while R2hsink has a value nacc which is 4 times higher. They should be compared with Fig. 1. In the absence of sink particles the disc is more extended due to prominent spiral patterns. With a higher value of nacc the disc is also a bit bigger and more massive (see Fig. 5) than the disc in run R2.
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