Fig. 1From: Detecting the changes of wood properties with respect to elapsed years since wood formation by the eigenvalue distribution of near infrared spectral matricesVariation of (a) the diffuse reflectance near-infrared (NIR) spectra and (b) their second derivative spectra with respect to the elapsed years since wood formation in hinoki cypress (Chamaecyparis obtusa). The colors of the lines change from blue to red with an increase in elapsed yearsBack to article page