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Relationship between the mean 13C discrimination (expressed as Δ, discrimination compared to air, ‰) and the mean ratio of net CO2 assimilation rate (A) to stomatal conductance (gs) for leaves of 15 varieties and accessions of mature coconut palms growing at Pottukulama Research Station, Sri Lanka in 2003. Bars indicate s.e.m., n=3. Line is linear regression, y=0.228x+22.7, R2=0.813, p<0.001. Results from Nainanayake (2004).
