Enraf–Nonius CAD-4 diffractometer	1470 reflections with I > 2σ(I)
Radiation source: fine-focus sealed tube	Rint = 0.045
graphite	θmax = 25.4°, θmin = 2.3°
ω/2θ scans	h = 0→7
Absorption correction: ψ scan (North et al., 1968)	k = −12→12
Tmin = 0.909, Tmax = 0.968	l = −20→20
4391 measured reflections	3 standard reflections every 200 reflections
2063 independent reflections	intensity decay: 1%