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Fig. 1

|Im()| as a function of viscosity and rigidity of the solid core. ωf = 2.5 × 10-4 rad s-1 and the core radius is a) 0.2 Rsb) 0.219 Rs; and c) 0.24 Rs. Two contours show the upper |Im(
)| = 2.5 × 10-4 and the lower |Im(
)| = 4 × 10-5 boundaries which are consistent with the observed values.
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