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Fig. 3.


Mode frequencies in the Carrington frame for the observations and the 2D model (Re σ). The symbols show the observed modes (diamonds for symmetric modes and squares for antisymmetric modes). The red symbols show the high-latitude modes, the orange symbols the critical-latitude modes, and the black symbols the equatorial Rossby modes. The rose- and gray-shaded areas show the observed frequency ranges of excess power (last column of Table A.1). For reference, the blue-shaded area gives the range of rotation rates at the equator between the surface and 0.95 R. The curves give the dispersion relations for the modes of the 2D model with νt = 100 km2 s−1 and δ = 0. The red curve is the dispersion relation for the high-latitude modes. The solid and dashed-black curves are for the fundamental (n = 0) and first overtone (n = 1) equatorial Rossby modes.

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