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Fig. 2. Canopy net photosynthetic rate (P_N) estimated from polynomial regression at 1200 µmol m^–2s^–1 photosynthetic photo flux density (PPFD) for five temperatures throughout the growing season. Data are means of 900 s intervals. Gaps in the data result from days with low light levels that were not included in the analysis. The vertical bars indicate times when plants were removed from the chambers for destructive harvest.

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