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. 2020 Jan 2;52(3):1140–1160. doi: 10.3758/s13428-019-01307-0

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© The Author(s) 2019

Open AccessThis 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. 2 — The stimulus grid. Stimulus grid for the Tobii, containing a Tobii calibration target at the center and eight ArUco markers at the corners and along the edges. For the other eye-tracking setups, different center markers were used. The stimulus grid used for our experiments spanned (horizontally and vertically) 105 × 73 cm (equivalent to 40 × 28^∘ when viewed from a distance of 1.5 m)