Fig. 4From: Examination of Cinnamomum camphora interlocked grain adopting X-ray computed tomography combined with particle image velocimetryRadial variation of the grain angle (δ) measured using PIV and 2D-FFT methods with a positive value indicating right-handed spirals grain and a negative value left-handed spirals grain as seen from the bark side. A dashed blue line represents the gray level profile along the radial direction with higher intensity correlating to higher density. The peaks represent the position of latewood that delineates annual ringsBack to article page