Fig. 1. Solid-state ¹³C nuclear magnetic resonance spectra with cross-polarization magic-angle spinning (CPMAS NMR) of (a) heartwood and (b) bark from the mid-section of a Douglas-fir stem and (c) weathered Douglas-fir bark from a roadside log handling site. Lower spectra are with dipolar-dephasing and total suppression of sidebands (DD–TOSS).