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. 2018 Jun 25;13(6):e0199628. doi: 10.1371/journal.pone.0199628

Fig 5. Spectral photon ratios measured in a glass greenhouse and two types of polytunnel.

Fig 5

UVB:PAR is x1000 for ease of comparison. Points are the mean of two measurements. The orange horizontal line in each panel represents the spectral photon ratio of full sunlight at the time and location of measurement.