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. Author manuscript; available in PMC: 2016 Jan 19.
Published in final edited form as: Med Image Comput Comput Assist Interv. 2015 Nov 18;9349:20–27. doi: 10.1007/978-3-319-24553-9_3

Fig. 2.

Fig. 2

For a Morse function f, all possible critical points, p, are shown on the first row with their indices on top. Upper (ϒ(t+δ)) and lower (ϒ(t–δ)) level sets are shown on the second and third rows (for t = f(p) and δ being a small positive number). The case where a loop forms by tracks in TDI is shown in the box.