Table 1. Initial values and upper and lower boundary fitting to Eq. [1].

Fitting parameters	Amy	Aax	Aex	$T_{2,my}^{*}$ (ms)	$T_{2,ax}^{*}$ (ms)	$T_{2,ex}^{*}$ (ms)	fmy (Hz)	fax (Hz)	fex (Hz)	φ0
Initial value	0.1|S1|	0.6|S1|	0.3|S1|	10	64	48	5	0	0	∠|S1|
Lower bound	0	0	0	3	24	24	−75	−25	−25	−ð
Upper bound	2|S1|	2|S1|	2|S1|	24	1,000	1,000	75	25	25	ð

S₁ is the complex signal of the first echo.