Table 1. Scaling statistics for data with different ice-ring treatments.

The HKL-2000 ▶ package (Otwinowski & Minor, 2001 ▶) was used in all cases with the same near-default parameters. The left block entitled ‘Using background rejection’ relied on DENZO’s rejection of measurements with uneven background, without pre-processing of the images. The center block pre-processed the images to exclude pixels within the resolution ranges of the ice rings. The right block used DeIce pre-processing to subtract the ice diffraction. Resolution shells containing the ice rings, in which there is greatest impact, are shown in bold.

	Using background rejection					Processed with ice rings excluded					Processed with ice-ring subtraction
Resolution (Å)	〈I〉	〈I/σ(I)〉	χ2	Rmerge	Completeness (%)	〈I〉	〈I/σ(I)〉	χ2	Rmerge	Completeness (%)	〈I〉	〈I/σ(I)〉	χ2	Rmerge	Completeness (%)
∞–4.27	34036	22.9	0.94	0.032	85	33769	22.9	0.94	0.032	85	34541	22.9	0.92	0.032	85
4.27–3.39	33383	19.1	0.99	0.036	57	33987	19.3	0.94	0.035	33	35182	19.2	1.19	0.037	90
3.39–2.96	18028	16.9	1.04	0.046	94	17872	16.9	1.03	0.046	94	18058	16.9	1.02	0.046	94
2.96–2.69	9364	13.1	0.95	0.057	95	9307	13.1	0.95	0.057	95	9367	13.1	0.96	0.057	95
2.69–2.50	6431	10.6	0.94	0.070	96	6407	10.6	0.94	0.070	96	6409	10.6	0.95	0.070	96
2.50–2.35	4996	9.3	1.01	0.084	96	4996	9.3	1.01	0.084	96	4960	9.4	1.00	0.084	96
2.35–2.23	3814	5.2	0.88	0.100	46	3891	5.3	0.90	0.106	40	4928	5.3	1.97	0.164	89
2.23–2.14	3088	4.5	0.85	0.121	71	3347	4.8	0.83	0.121	60	3613	5.1	1.13	0.128	96
2.14–2.05	2831	6.4	1.16	0.144	97	2838	6.4	1.16	0.144	97	2796	6.4	1.17	0.146	97
2.05–1.98	2216	5.5	1.19	0.172	97	2201	5.4	1.18	0.173	97	2217	5.5	1.20	0.172	97
1.98–1.92	870	2.4	1.22	0.312	63	1093	2.9	1.24	0.283	43	1986 ▶	4.6	1.96	0.261	95
1.92–1.87	318	0.7	1.04	0.666	38	831	1.5	0.94	0.371	20	1881	2.3	1.46	0.348	94
1.87–1.82	713	2.6	1.23	0.402	98	709	2.6	1.25	0.406	98	736	2.7	1.26	0.391	98
1.82–1.77	662	2.5	1.24	0.431	98	663	2.5	1.24	0.430	98	658	2.5	1.25	0.434	98
1.77–1.73	560	2.1	1.27	0.504	98	558	2.1	1.28	0.510	98	547	2.1	1.28	0.516	98
∞–1.73	7891	12.3	1.07	0.064	82	7671	12.2	1.08	0.065	77	8244	11.7	1.23	0.069	95