Table 2.

Correlation between exchange-broadening and chemical shifts in ShK.

Residue	Φexa × 103 (s−2)	δ15N ppm	δ15NRCb ppm	(Δδ15N)2 × 106 (s−2)
M21	27.5a	130.4	119.6b	17.0c
L25	22.4	111	121.8	17.0
H19	16.8	112.9	118.2	4.1
K18	14.5	115.4	120.4	3.6
T31	11.6	124.2	113.6	16.4
Y23	10.5	120.2	120.9	0.1
S10	9.3	113.9	116.3	0.8
C12	8.7	122.4	120.1	0.8
T13	8.4	110.2	113.6	1.7
K9	8.3	123.9	120.4	1.8
R24	6.4	117.2	120.5	1.6

^aFrom the global fit at 14.1 T

^bBased on BMRB chemical shift statistics, http://www.bmrb.wisc.edu

^cCalculated as (δ¹⁵N – δ¹⁵N_RC)2 × (ω_N)² at 14.1 T