6CYANA: couplings set - CYANA command

Parameters: selection=<string>             (default: <blank>)
            value=<string>                 (default: <blank>)
            tolerance=<string>             (default: <blank>)
            weight=<string>                (default: <blank>)
            karpluscurve=<string>          (default: <blank>)

This command sets properties of the scalar coupling constant restraints
that match the selection <string>. By default, the selection made
in the most recent 'couplings select' command is used, or all scalar
coupling constant restraints if no selection has been made so far.

Properties that can be set:

- value         scalar coupling constant value
- tolerance     scalar coupling constant tolerance
- weight        relative weight of the restraint
- karpluscurve  Karplus curve parameters

Karplus curves must be specified in the form A+B*cos(d)+C*cos(d)**2,
where A, B and C are real numbers, and d denotes the value of the
torsion angle formed by the two scalar coupled atoms.
