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Comparisons between the ATR-FTIR model estimated and the reference method measured contents of the marker components of Indigo Naturalis. (a) Calibration samples (●) of the indigo model; (b) Validation samples (▲) of the indigo model; (c) Calibration samples (●) of the indirubin model; (d) Validation samples (▲) of the indirubin model; (e) Calibration samples (●) of the calcium model; (f) Validation samples (▲) of the calcium model.
