Table 2. Comparison of triclinic and monoclinic refinements, including twinning.

	Triclinic P	Monoclinic P21/n	Triclinic P twinned
Z′	2	1	2
R int	0.053	0.132	0.053
R w (on F 2, all data)	0.133	0.145	0.098
R (on F, data with F 2 > 2σ)	0.058	0.065	0.043
Max K in analysis of variance	4.01	7.47	1.09
Max difference peak (e Å−3)	1.32	0.83	1.13
Twin fraction			0.832 (2):0.168 (2)