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Figure 2
Sap flow (ten-min mean values) in relation to light intensity from DOY 158 to 174 for three sensors of Dayau-gauges (left boxes) and EMS-type gauges (or Baby gauges) (right boxes). No base-line subtractions were carried out for Dayau-gauges. Regression lines are according to the model: y = α + β × ln (x + 1) .