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. 2017 Nov 6;8:1330. doi: 10.1038/s41467-017-01207-x

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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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Fig. 2 — Formation and evolution of the magnetic flux rope’s feet in 1600 Å. a Shows the morphology with two irregular bright rings (highlighted by rectangles) attached to the far ends of flare ribbons. The footpoint associated with negative polarity (FP−) is shown in b–e and that associated with positive polarity (FP+) in f–i. e, i Show dimming in 304 Å base-difference images. The dimmed pixels within FP− and FP+ are replotted in d, h in blue and red colors, respectively. Four virtual slits (S1–S4) are indicated in a, b, f, with their starting point marked by ‘0’