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. 2018 May 21;13(5):e0197260. doi: 10.1371/journal.pone.0197260

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© 2018 Asatani et al

This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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Fig 4 — (a) The horizontal axis shows the cutoff year C_y. The vertical axis shows the correlation between each paper’s IPY of 2014 papers and the number of 2016 citations. (b,c) This is the same plot of solar cells and APS.