Fig. 1.
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Ratio of sound speed to Alfvén speeds in xz cuts taken from quiet Sun and coronal hole simulations. The simulation times are taken at 140 minutes and 40 seconds s and at y coordinates 3.10 Mm. Overplotted are the magnetic field lines, with the thickness of the lines being scaled by the logarithm of the field strength, log10‖B‖.
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