Table 4 Model parameter means and standard errors (SE), F ratios and the significance of differences among the means for three sampled sites for air-dry density (wood density), microfibril angle (MFA) and dynamic modulus of elasticity (MOE) as a function of cambial age

  Asym_core¹

562.0^a (8.4)

523.0^b (8.6)

520.0^b (7.2)

8.2**

  Asym_outer²

668.1^ab (23.4)

704.5^a (21.3)

619.6^b (18.7)

4.6*

  Xmid³

10.5^a (0.9)

10.2^a (0.7)

9.0^a (0.8)

1.1^ns

  scal⁴

0.8^a (0.3)

1.3^a (0.3)

1.1^a (0.3)

0.8^ns

  RMSE⁵ (kg m⁻³)

24.8

19.8

21.6

 Asym_outer²

7.9^ab (0.5)

8.2^a (0.6)

6.4^b (0.4)

4.3*

  R0⁶

21.5^a (1.2)

22.3^a (1.1)

22.2^a (0.8)

0.1^ns

  lrc⁷

− 1.0^a (0.1)

− 1.4^ab (0.1)

− 1.5^b (0.1)

5.8**

  RMSE⁵ (degrees)

1.9

1.6

2.1

  Asym_outer²

18.7^a (1.5)

20.0^a (1.5)

22.2^a (1.7)

1.2^ns

  Xmid³

0.8^a (0.8)

2.5^ab (0.8)

3.8^b (0.8)

3.6*

  scal⁴

3.4^a (0.5)

4.4^ab (0.5)

5.8^b (0.5)

5.9**

  RMSE⁵ (GPa)

1.1

1.0

1.0