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Contents of the four flavonoids in LT race cultivated after one (2008), two (2009) and four years (2011). Values shown are mean for the three gardens (light intensity 50–180 μmol/m2/s). The two axes of coordinates represent the content of each flavonoid and the total of the four flavonoids (epimedin A, B, C, and icariin). Bars are standard errors.
