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. 2014 Apr 18;41(5):051906. doi: 10.1118/1.4870989

Figure 1.

Figure 1

Four pairs of Fourier-domain transfer functions according to approximation 13. The original functions represented by the left-hand side of Eq. 13 are shown in solid curves and the three-term expansions represented by the right-hand side of Eq. 13 are shown in dotted curves.