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. Author manuscript; available in PMC: 2013 Sep 16.
Published in final edited form as: IEEE Trans Med Imaging. 2012 Aug 15:10.1109/TMI.2012.2213304. doi: 10.1109/TMI.2012.2213304

Fig. 3.

Fig. 3

The first eight eigen-functions of the Sturm–Liouville problem. The boundary points are a1 = −2.56, a2 = −1.0, a3 = 1.0, and a4 =2.56.