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. Author manuscript; available in PMC: 2013 Mar 1.
Published in final edited form as: Comput Med Imaging Graph. 2011 Oct 19;36(2):139–151. doi: 10.1016/j.compmedimag.2011.09.001

Fig. 3.

Fig. 3

A real world example of directionality (from Google Map). The minimum driving distance between two locations is 1.2 miles (from A to B) and 0.7 mile (from B to C (or A)), respectively.