Note
The Amber charge is converted to electron charges as used in MDAnalysis and other packages. To get back Amber charges, multiply by 18.2223.
| AMBER flag | MDAnalysis attribute |
| ATOM_NAME | names |
| CHARGE | charges |
| ATOMIC_NUMBER | elements |
| MASS | masses |
| BONDS_INC_HYDROGEN BONDS_WITHOUT_HYDROGEN | bonds |
| ANGLES_INC_HYDROGEN ANGLES_WITHOUT_HYDROGEN | angles |
| DIHEDRALS_INC_HYDROGEN DIHEDRALS_WITHOUT_HYDROGEN | dihedrals / improper |
| ATOM_TYPE_INDEX | type_indices |
| AMBER_ATOM_TYPE | types |
| RESIDUE_LABEL | resnames |
| RESIDUE_POINTER | residues |
The format is defined in PARM parameter/topology file specification. The reader tries to detect if it is a newer (AMBER 12?) file format by looking for the flag "ATOMIC_NUMBER".