Table 1.
Information on experimental samples

Province	No. of Tree ring	Diameter (cm)	Average annual ring width (cm)	Latewood ratio (%)	Tree trimming year
Goseong	85	48	3.1	22.87	2013
Hongcheon	82	42	2.6	20.19	2012
Bonghwa	76	45.5	3.1	18.57	2014