Table 1. Data-processing statistics.

Values in parentheses are for the highest resolution shell.

	Data set 1	Data set 2
Space group	R3	R3
Unit-cell parameters (Å, °)
Hexagonal	a = b = 257.8, c = 607.0	a = b = 257.7, c = 603.8
Rhombohedral	a = 251.2, α = 61.73	a = 250.7, α = 61.96
No. of observations	78243	177517
Unique reflections	76529 (4081)	147388 (3727)
Resolution (Å)	100–3.0 (3.07–3.00)	100–2.6 (2.66–2.60)
Rmerge† (%)	6.7 (9.4‡)	6.6 (42.2‡)
〈I〉/〈σ(I)〉	5.55 (1.92)	6.14 (1.11)
Completeness (%)	12.7 (10)	32.1 (12)

^† R _merge = , where I _i(hkl) is the ith observation of a symmetry equivalent of reflection hkl.

^‡The highest resolution shell has no symmetry-equivalent reflections and therefore R _merge was calculated in medium-resolution shells (4.7–4.3 Å for data set 1 and 2.9–2.8 Å for data set 2).