Fig. 1From: Use of near-infrared reflectance spectroscopy for the rapid determination of the digestible energy and metabolizable energy content of corn fed to growing pigsReflectance spectra of corn (n = 117) in different spectral pre-treatments. (a) Raw spectra; (b): Derivative 2,4,4,1; (c): Derivative 2,4,4,1 + Standard normal variate plus detrend correction (SNVD)Back to article page