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Fig. 13
Reduction factor N of the Toomre parameter as Q = Q0/N, as a function of the radial extent of the vortex, for different values of the Rossby number and in the case of an isothermal disk, α = 1 (red curves) or an adiabatic disk, α = γ (black curves). The radial extent χr is scaled to the maximal size 
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