Table 3. Structure-model categories.

	Cutoff values
Category	Reflections per atom†	Data resolution
xlow	<1.0 reflections per atom	Resolution ≥ 5.00 Å
vlow	1.0 ≤ reflections per atom < 2.5	3.50 Å ≤ resolution < 5.00 Å
low	NA†	2.80 Å ≤ resolution < 3.50 Å
medium	NA†	1.70 Å ≤ resolution < 2.80 Å
high	NA†	1.20 Å ≤ resolution < 1.70 Å
atomic	NA†	Resolution < 1.20 Å

^†Reflections per atom takes precedence over data resolution.

^‡In these categories only resolution cutoffs are used.