Fig. 6From: Effects of altitude and slope on the climate–radial growth relationships of Larix olgensis A. Henry in the southern Lesser Khingan Mountains, Northeast ChinaMann–Kendall mutation test curves of tree-ring width index with forward statistic UF (solid line) and backward statistic UB (dashed line) at the 0.05 significance level (dotted horizontal lines). The intersection of the UF and UB curves is located between the critical lines, corresponding to the time the mutation beginsBack to article page