Fig. 6. Relationship between the reflectance curvature index [CUR; (R₆₇₅·R₆₉₀)/R₆₈₃²] measured from leaf samples (experiment with C_a+b constant) and modeled by fluorescence–reflectance–transmittance (FRT)–PROSPECT. F^'_m110 was used as input for in FRT–PROSPECT model.