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. 2018 Feb 13;8:2921. doi: 10.1038/s41598-018-21333-w

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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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Activation in representative rabbit panoramic optical data. (A) The time course of pacing activation is tracked using membrane potential. A paced beat starts on the left ventricular free wall and the divergent wavefronts are tracked over time around both the posterior and anterior sides to where they meet on the right ventricular free wall. Wavefronts are uninterrupted by artifact or discontinuity. (B) On the left, a 2D Mercator projection of the isochronal activation map generated using the processing GUI. On the right, a 2D Hammer projection whose latitude and longitude divisions are the same as seen in the Mercator projection.