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. 2020 Mar 23;52(5):2098–2121. doi: 10.3758/s13428-020-01363-x

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© The Author(s) 2020

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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 11 — Numbers 3-10 of the ten 20^′ steps, for five different eye-trackers. Each stop is 1 second long. Blue lines show the actual step size of 20^′. Notice how recorded step sizes vary in all eye-trackers, and that each eye-tracker has its own specific errors. The data from the DPI have very small errors that could originate from errors in our Stepperbox. The noise in the Spectrum signal is probably because of the artificial eyes, which, however, should not affect step sizes.