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Table 2 Correlation coefficients between different experimental quality parameters on the all PDB set.

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

  R-free σA Luzzati DPI
Resolution 0.62 0.80 0.86 0.86
R-free   0.66 0.82 0.55
σ A    0.87 0.77
Luzzati     0.84