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. Author manuscript; available in PMC: 2014 Nov 15.
Published in final edited form as: J Neurosci Methods. 2013 Sep 30;220(2):167–178. doi: 10.1016/j.jneumeth.2013.09.011

Figure 1.

Figure 1

Gaps, overlaps, and extrusions arise in both 2D (isosceles trapezoids: A, C) and 3D (frusta: B, D). The measured join location is shared by the face center points of both objects. When two non-parallel sections with constant radii meet (A, B), some portions of the sections necessarily overlap; in other spots the edges will fail to meet, leaving a gap that exposes the face. If the radii decrease away from a non-parallel join (C, D), in addition to the gap and overlap problems, some portions of the sections may extrude beyond the other section.