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. 2023 Jul 10;20:26. doi: 10.1186/s12989-023-00537-7

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© The Author(s) 2023

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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Fig. 2 — Normalized particle size distributions from candle experiments: Legend: (a) shows exposure session performed on 21.11.19 using nano DMA. (b) and (c) show exposure session performed on 05.11.19 using long DMA. Panels (b) and (c) show the same data but plotted with linear axis in (b) and logarithmic axis in (c) to better highlight the larger particle mode. Each curve was calculated as the median from 10 scans. The blue lines depicts the humidified distribution (RH ~ 90%), whereas the red and orange lines show the dry distributions recorded before and after the period of humidification (RH ~ 43%; conditions in the exposure chamber)