Table 1.

Calibration and predictive results of NIR based multivariate (PLS) models.

Chemistry	Raw Spectra			First Derivative
	r2	RMSEP	RPD	r2	RMSEP	RPD
Extractives	40.7	1.18	1.21	85.0	0.98	1.45
Lignin	82.6	1.35	1.78	90.4	1.12	2.15
Cellulose	37.6	2.10	1.00	81.0	1.03	2.04
Hemicellulose	41.9	3.17	1.23	93.5	1.43	2.72