Final snapshot of each SPH simulation at 10 000 yr, shown in the plane of the disc. Top row: column density of the simulations with a density of 1.9 × 10-18 g/cm3 and velocities of 5, 10, and 20 km s-1 from left to right. Bottom row: simulations with the same velocities and the higher density of 1.9 × 10-17 g/cm3. We note that the spatial and colour scales are different for each row to provide a better contrast for the spirals in the discs.
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