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Regression between mean number of visits per flower per hour (Vf) and pollen limitation index (L). L = 1 – (Po/Ps) where Po is the seed set of open-pollinated flowers and Ps is the seed set of supplemented flowers; a value of L = 0 indicates no pollen limitation. Regression equation y = 0·52 – 0·1x; R2 = 0·67; P < 0·001.
