Fig. 4. Best-fit regressions of leaf total chlorophyll (a + b) concentration versus leaf reflectance (R), transmittance (T), absorptance (A), and band ratios. Regressions were based on a power function as indicated atop the figure and data combined among the four planar-leaved species. Regression parameters, including the coefficient of determination (r²) and standard deviation of the estimate (s), are listed for each regression (168 samples).

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