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. 2020 May 20;11:2527. doi: 10.1038/s41467-020-16018-w

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© The Author(s) 2020

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 — Hemispherical directional reflectance factors (HDRFs) of green snow algae, showing representative spectra from high (solid, green line) and low (dashed, green line) cell density patches of snow algae with corresponding I_B4, sampling site photograph and brightfield microscope image (black scale bar represents 5 μm). HDRFs, photographs and microscopy from snow sampled close to Refugio Collins, King George Island, Antarctica.