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a–b, Maps portraying the concentration weighted trajectory (CWT) values for the total intensity of terrestrial-derived organic matter (TOMCWT; lignin and tannin, a) and microbial-derived organic matter (MOMCWT; carbohydrate and protein, b) during the observation period. c, The relationship between the TOMCWT and MOMCWT during the period. The solid line indicates the best fit.
