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Figure 4
Total quinone content (%) of teakwood by age and radial position. Mean of 5 trees (8 and 51 years old) and 4 trees (30 years old), with the standard deviation in the error bar. The same letters are not significantly different at p < 5% by Duncan’s test. OS = Outer sapwood, IS = inner sapwood, OH = outer heartwood, MH = middle heartwood, IH = inner heartwood.