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. 2018 Jun 15;8:9177. doi: 10.1038/s41598-018-27480-4

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© The Author(s) 2018

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Summary figure plotting center-to-center critical spacing versus target size for our results and relevant results from the literature. Each marker type represents a study or individual observer. The color of each symbol indicates the asymptotic (unflanked) performance level, as shown by the colorbar. Gray and colored lines connect results from a single study (or observer from a study). Black dotted line indicates proportional regime (CS = 1.4 × size) for ~90% correct).