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Fig. 2.
Analytically obtained growth rates of the most unstable modes, depicted as solid lines. The symbols °, ×, and ⋄ correspond to simulations with β = τcΩ0 = 6, 10 and no cooling respectively. The classical Toomre case (no cooling) prevents stability for Q0 > 1. The cooled cases are unstable for all Q0.
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