Sectoral power spectrum (ℓ = m) of the radial vorticity for RDA data at depth 0.7 Mm. The solid red line indicates the Rossby wave frequencies from LGBD19 for m = 3 and from LGBS18 for m ≥ 4. Frequency intervals for the Rossby wave region and the background region are indicated by the red and black dashed lines, respectively. The ridge of power at positive frequencies is due to the first side lobe of the window function. For better visibility of the Rossby waves at low m, the power is normalized at each m by the frequency average over [−300, 100] nHz. The color scale is truncated at 50% of the maximum value (black).
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