Table 1. Correlations between the angles of different branches.

Traita	ALLBA	1-5BA	1-4BA	1-3BA	1-2BA	1BA	2BA	3BA	4BA
1-5BA	0.93***
1-4BA	0.92***	0.99***
1-3BA	0.86***	0.95***	0.98***
1-2BA	0.79***	0.90***	0.94***	0.97***
1BA	0.71***	0.81***	0.84***	0.86***	0.92***
2BA	0.75***	0.85***	0.88***	0.92***	0.92***	0.69***
3BA	0.81***	0.85***	0.86***	0.85***	0.69***	0.54**	0.72***
4BA	0.90***	0.89***	0.86***	0.74***	0.68***	0.64***	0.61***	0.71***
5BA	0.78***	0.83***	0.72***	0.64***	0.57***	0.51**	0.53***	0.65***	0.79***

^aALLBA: average angle of all branches; 1-5BA: average angle of the five branches from the top; 1-4BA: average angle of the four branches from the top; 1-3BA: average angle of the three branches from the top; 1-2BA: average angle of the two branches from the top; 1BA: angle of the first branch from the top; 2BA: angle of the second branch from the top; 3BA: angle of the third branch from the top; 4BA: angle of the fourth branch from the top; 5BA: angle of the fifth branch from the top. The significance level: *p ≤ 0.05; **p ≤ 0.01; ***p ≤ 0.001.