.. _config_ref tasks terminate package namd constraints:

``constraints``
===============

Parameters controlling position constraints

Single-valued attributes:

  * ``atoms``: Atoms to be position-constrained expressed as a VMD atomselection

  * ``k``: Restraint spring constant in kcal/mol/A^2

  * ``consfile``: Name of constraints PDB file (defaults to basename-constraints.pdb)



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