Table 3.

Parameters calculated from the GL model fit of f_L vs. cortical surface normal orientation (for gray matter) and f_L vs. principal fiber orientation (for white matter)

	Gray matter		White matter
ROI location	Δχ, ppb	r	Δχ, ppb	r
Left brain, S1	2.55 ± 1.60	0.871	25.13 ± 3.77	0.780
Right brain, S1	4.04 ± 1.96	0.734	20.11 ± 2.64	0.759
Left brain, S2	4.46 ± 2.91	0.736	31.40 ± 5.03	0.654
Right brain, S2	6.92 ± 2.18	0.940	27.60 ± 7.03	0.783
Left brain, S3	3.05 ± 2.28	0.670	23.88 ± 2.89	0.895
Right brain, S3	5.94 ± 1.89	0.840	21.36 ± 8.80	0.601

The susceptibility values are referenced to the average susceptibility of surrounding gray matter. Data are shown for each of the three brain samples (e.g., S1 = brain sample 1). Pearson correlation coefficients (r) are given in the right-most column of the table.