Fig. 10
Rossby number at the vortex centre, as a function of the aspect ratio χθ for the vortices used in our sample (black circles). Different expressions relating these two quantities are shown: the GNG model (solid line) which underestimates Ro as soon as χθ< 7, and the Gaussian model (dashed line) which better fits the data for 2 <χθ< 20. We note the logarithmic scale for χθ.
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