Table 1.

Summary of the atomic models and refinement statistics of (GGCAGCAGCC)₂

Crystal form	R32:H	P32
Resolution (Å)	0.95	1.9
Overall mean B-factor (Å2)	11.4	24.4
Number of reflections: work/test	21 748	15 413/821
R-value (%)	10.6	21.17
R-free (%)	–	24.82
RNA atoms	213	1278
Water molecules	86	170
No. sulphate ions	1	6
R.m.s.d. in bonds (Å)	0.016	0.006
R.m.s.d. in angles (°)	2.0	1.4