Table 2. Results of automatic ice-ring detection in phenix.xtriage (Zwart et al., 2005 ▸) and CTRUNCATE (Winn et al., 2011 ▸) for 200 cases randomly selected from the PDB, as described in §5.2.

There were 42 data sets that contained ice rings (see test set C in the Supporting Information). Six cases where data at ice-ring resolutions had been omitted were included in this test set. phenix.xtriage gives a message if only one ice ring has been found instead of an ice-ring warning; for the purposes of this test these messages were treated as ‘positives’.

	Correct positives	Correct negatives	False positives	False negatives
phenix.xtriage	14/42	145/158	13	28
CTRUNCATE	23/42	88/158	70	19
AUSPEX	25/42	143/158	14	17