Enraf–Nonius CAD-4 diffractometer	1427 reflections with I > 2σ(I)
Radiation source: fine-focus sealed tube	Rint = 0.035
graphite	θmax = 25.3°, θmin = 2.1°
ω/2θ scans	h = 0→11
Absorption correction: ψ scan (North et al., 1968)	k = −12→11
Tmin = 0.952, Tmax = 0.988	l = −13→12
3346 measured reflections	3 standard reflections every 120 min
3140 independent reflections	intensity decay: 1%