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. 2024 Dec 18;20:184. doi: 10.1186/s13007-024-01312-1

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© The Author(s) 2024

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Fig. 4 — Visualization of the coefficient of determination (R²) for the optimal band or band combinations of the four narrow-band models against leaf water content (LWC) of Populus alba var. pyramidalis. SB single band (a), BR band ratio (b), BS band subtraction (c), NBD normalized band difference (d)