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. 2014 Jul 24;14:31. doi: 10.1186/1471-213X-14-31

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Copyright © 2014 Percival et al.; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Intraobserver landmark placement error. Intraobserver error of each landmark (LM) for each observer at E10.5 (A), E11.5 (B), and E12.5 (C), calculated as the euclidian distance between the landmark coordinates recorded in the two landmark placement trials. The calculations are combined for left and right versions of bilateral landmarks. The reference value of 0.1 mm discussed in the paper is shown as a dotted horizontal line. Observers 1, 2, and 3 are experienced with landmarking, while observer 4 is a first time landmarker.