Parameters	Pinus montezumae			Pinus pseudostrobus
Parameters	$a_{0}$	$a_{1}$	$a_{2}$	$a_{0}$	$a_{1}$	$a_{2}$
$a_{0}$	0.00612	−0.00305	0.02068	0.00995	−0.00220	0.02662
$a_{1}$	−0.00305	0.00181	−0.00600	−0.00220	0.00056	−0.00410
$a_{2}$	0.02068	−0.00600	0.14495	0.02662	−0.00410	0.12504
Variance function	0.06510	0.08232	0.09953	0.04200	0.04886	0.05571
Within-group standard error	0.63651	0.75493	0.89537	0.86519	0.96558	1.07763
Residual of random effects	0.75493			0.29982