| -select CA | Atom selection (default all). |
| -bonds | List all bond lengths. |
| -angles | List all angles. |
| -verbose 7 | Verbosity of output. |
| -elements | Use elements as identifiers rather than atom names. |
| -from input.pdb | Extract parameters from an atomic coordinate file. |
| -parameters parm.star | Molecular parameter file (default atom_prop.star) |
| -output param.star | Output parameter file. |