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Fig. 5. Correlation between the humification index determined by LIF spectroscopy (H_LIF) in whole soil samples and the humification index I₄₅₄/I₃₉₉ (Kalbitz et al., 1999) determined by conventional fluorescence in the corresponding humic acid samples at (a) Costa Rica and (b) Dourados sites. The indexes are expressed as arbitrary units (a.u.).