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Fig. 7.

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Normalised surface density Σ/Σc0 in the (lnR, θ) plane for the same runs and times as shown in Figure 6. The radial range in this figure is chosen to highlight the annulus from 2 − 4 kpc where feather formation is strongest. We can see the feathers appear as sloped lines that are periodic in azimuth, with length, thickness, orientation and spacing that vary with ℳc. The associated time evolution movies are available online.

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