Fig. 7
From: Investigation of regional variation in core flow models using spherical Slepian functions
Decomposition of inverted flow from satellite data in eastward direction (\(u_{\phi}\)). 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 patch. The Shannon number (\(K=178\)) produced a similar decomposition, but the unwanted boundary signals were slightly larger compared to the optimum K decomposition, which is shown in this image