topology {<dynamics-torsion-topology-statement>} end
<dynamics-torsion-topology-statement> :==
kdihmax=<real>
Threshold for selecting torsions as free to rotate.
Rotation will be permitted around torsion angles with force constants
less than this cutoff value. Torsion angles with force constants above
this value will be constrained during dynamics.
maxtree=<integer>
Maximum number of trees allocated. This is the number of independent,
ie. unconnected bodies in the system.
maxchain=<integer>
Maximum number of chains per tree. A chain is a connected set of
unbranched torsion angles.
maxlength=<integer>
Maximum length of a chain in a tree. ie. the number of torsion angles
in an unbranched chain.