Figure 4
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(a) and (b) present fit residue maps ΔSz obtained after using least squares projections based on Forbes Q freeform polynomials to represent both FEM solutions. (c) presents power spectral density (PSD) cross-sections extracted from both residue maps shown in (a) and (b). (d) provides a comparison between ΔSz RMS curves as a function of the expansion index T.
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