Table 1.

Experimental and calculated spin Hamiltonian parameters for WT Cu_A Az and the M123X (X = Q, L, H) variants

Axial variants	Exp.			Calc.
	gz	AzCu1*	AzCu2	gz	AzCu1	AzCu2
		(10−4⋅cm−1)			(10−4⋅cm−1)
WT	2.177	53	53	2.192	55	63
M123Q	2.174	61	57	2.190	60	68
M123L	2.215	35	35	2.209	48	59
M123H	2.255	58	42	2.214	52	55

^*Note that the experimental A-values are approximate and dependent on the fit protocol. Results of two fits are given in SI Appendix, Fig. S3.