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. 2017 Apr 19;7:926. doi: 10.1038/s41598-017-01099-3

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© The Author(s) 2017

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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Linear exposure technique. (a) Exposure procedure. The pink and yellow rectangles denote the substrate and the reference grating G₀ respectively. The blue rectangles denote the sub-beams B_R1-2, B_L1-2, and B_E1-2. The gray rectangle denotes the attenuators A_1-2. The black rectangle denotes the baffles S_1-2. (b) Exposure dose distribution. The black solid, blue dash-dotted, and red dashed lines respectively denote the exposure doses during stationary, linear, and scanning exposures.