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. 2014 May 13;5:3794. doi: 10.1038/ncomms4794

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Only experiments for which data were available in J m⁻² were used (n=12). Trend line for the linear regression is (y=0.97x; R²=0.9). Both the x axis and the trend line have been broken to help the display the relationship across the full range of incident wave energy.