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Table 5 Threshold levels used to define the experimental quality classes on the all PDB set.

From: TAP score: torsion angle propensity normalization applied to local protein structure evaluation

  Medium High Very High
Resolution <= 2.5 <= 2.2 <= 1.7
R-free <= 0.3 <= 0.25 <= 0.22
Relative frequency 76.7% 42.2% 8.7%
# Cases 10,771 5,926 1,222