Table 3.

Results of the multiple regression analyses for R2* and phase shift for all specimens.

Dependent variable	Independent variable	Beta	p	Regression equation
R2*	Iron concentration	0.30	< 0.05	R2* = 0.098 ∗ [Fe] + 48.78 ∗ MTR + 8.46
MTR	0.52	< 0.001
Phase shift	Iron concentration	− 0.08	0.52	Phase shift = − 5.73 ∗ MTR + 1.87
MTR	− 0.42	< 0.005

p = p-value, [Fe] … iron concentration is given in mg/kg wet mass.