Table 3. Performance of Selected SE Methods for the Energies and Structures of Peptides in the Set Considered by Thiel and Co-Workers^226 a.

	AM1	OM2	DFTB2/mio
relative energies (kcal/mol)	2.0	1.7	1.1
backbone H-bond lengths (Å)	0.22	0.34	0.26
backbone dihedral angles (deg)	17	12	9

^aPresented are mean unsigned deviations from the respective references; data are taken from ref (33).