True Positive (TP):
It's the number of matchings in the reference structure, which are correctly predicted. This factor can be used for evaluating the homology degree for the two structures.False Negative (FN):
It's the number of present matchings in the reference structure, which are not predicted.False Positive (FP):
It's the number of present matchings in the predicted structure, which are not in the reference structure.Epsilon (ε):
Defined by Gardner and Giegerich [BMC Bioinformatics, 2004].