Table 2. Phasing and anomalous signal analysis of data collected at different wavelengths.

Data set	A2	B1	C1	D1
Wavelength ()	2.00	2.00	2.70	2.70
Data resolution ()	50.002.70	50.002.70	50.002.95	50.003.20
Best heavy-atom searching resolution ()	4.00	3.80	3.60	N/A
Best phasing resolution ()	3.50	2.50	3.30	N/A
† (%)	2.14		3.61
R anom ‡	0.023	0.033	0.054	0.059
R p.i.m. §	0.015	0.033	0.049	0.051
R anom/R p.i.m	1.53	1.00	1.10	1.16
d/sig(d)¶	1.80	1.32	1.15	0.88
CC(all/weak)††	47.40/23.42	30.16/9.55	35.79/11.22	34.19/10.83
‡‡	66.56	69.73	70.90	74.04

^† = F _anom/F _P = (2N _A/N _P)^1/2 (f _A/Z _eff), where N _A is the number of anomalous scatterers, N _P is the approximate total number of non-H atoms and Z _eff is the effective atomic number (6.7 for non-H protein atoms).

^‡ R _anom = 100 .

^§ R _p.i.m. = 100 .

^¶Calculated in the 50.003.10 resolution range.

^††Correlation coefficient in SHELXD.

^‡‡Average phase difference between model phases and S-SAD experimental phases calculated by the program CPHASEMATCH in the CCP4 suite.