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. 2018 Jul 3;9:2580. doi: 10.1038/s41467-018-04972-5

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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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Fig. 2 — Time series of oxygen and water neutral number densities. Time series of the O₂ (orange) and H₂O (blue) neutral number densities (left y-axis) from March 6 to 23, 2016. The spacecraft was located at about 10 km from the nucleus. Note that the H₂O neutral densities have been multiplied by 10⁻² to fit on this scale. Time series of the total RPC–ICA energetic water-group ions (H₂O⁺, H₃O⁺, OH⁺) of cometary origin (green), corrected for the RPC–LAP spacecraft potential¹⁵ and integrated over the effective energy range of the Eley–Rideal reactions (50–300 eV)⁴ (right y-axis)