Table 1.

Parameters of the established PLSR model.

	CV	TSV
RMSEC in µmol/g	21	21
RMSECV or RMSEP in µmol/g	24	22
R2calibration	0.90	0.90
R2validation	0.88	0.88
% RSDPLSR	8.0	7.5
Factor	2	2
Calibration range in µmol/g	156–444

Abbreviations: full cross validation (CV), test-set validation (TSV), root mean square error of calibration (RMSEC), root mean square error of cross validation (RMSECV) for CV, root mean square error of prediction (RMSEP) for TSV, coefficient of determination (R²), relative standard deviation (RSD).