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. 2017 Jan 9;292(1):25. doi: 10.1007/s11207-016-1049-0

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© The Author(s) 2017

Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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.

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The distribution of twist for an erupting flux rope beginning with a pre-formed flux rope with twist $Φ_{r} = 8 π$ . The configuration is the same as in Figure 12, and the dashed curve, labeled “zipper”, repeats the case $Φ_{0} = 0$ from that plot.