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Fig. 3
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Sign of the Rayleigh discriminant Φ(r) in the parameter space (r/R0, Ω0/f) where black regions indicate Φ < 0 and white regions indicate Φ ≥ 0. Upper and lower dashed lines represent the upper limit (Ω0/f = 1.81) and the lower limit (Ω0/f = −0.5) that bound the cen-trifugally stable region.
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