Fig. 8
From: Investigation of regional variation in core flow models using spherical Slepian functions
Decomposition of inverted flow from satellite data in southward direction (\(u_{\theta}\)). Decomposition of steady flow model obtained from satellite data (up to degree 20) using an ‘optimum’ value of \(K = 199\) (coefficients out of 441) to represent flow within the patches. The Shannon number (\(K=178\)) produced a similar decomposition, but the unwanted aliasing was slightly larger compared to our chosen ‘optimum’ K decomposition, which is shown in this image