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Plant nitrogen concentration (PNC, %) plotted against counterpart vegetation indices from two platforms: (A) NDVIa; (B) CIRE−a; (C) CIG−a; (D) OSAVIa; (E) VIopt−a; (F) NDVIg; (G) CIRE−g; (H) CIG−g; (I) OSAVIg; (J) VIopt−g. The dashed line is fitted for all data points.
