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. 2015 Apr 1;6(2):67–85. doi: 10.1068/i0701

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© 2015 J Koenderink, A van Doorn, L Albertazzi, J Wagemans Published under a Creative Commons Licence

This article is distributed under the terms of the Creative Commons Attribution 3.0 License (http://www.creativecommons.org/licenses/by/3.0/) which permits any use, reproduction and distribution of the work without further permission provided the original work is attributed as specified on the SAGE and Open Access page (http://www.uk.sagepub.com/aboutus/openaccess.htm).

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Figure 6. — Left: The projections of all observers on a number of principal component planes. The observers in cluster I plotted in red, those in cluster II in blue. The centers of the clusters were defined as their barycentra. Notice that the first four principal components explain more than 80% of the variation in the voting orders, thus this figure yields a fair impression of the clusters. Right: Smooth histograms of the figure of merit (FOM) distribution over the type C observers, and the two clusters (black: type C observers; red: cluster I; blue: cluster II).