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Fig. 2.

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Damping rate of the least-damped baroclinic mode in the spherical Boussinesq model as a function of the ratio N=N*/2Ω*, for P = 0 $ {\mbox {${ {\cal {{P}}} }$}} = 0 $ and Et = 10−3. Dots represent numerical solutions, while the solid line corresponds to the approximate solution given by (14).

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