6CYANA: angles set - CYANA command

Parameters: selection=<string>             (default: <blank>)
            value=<string>                 (default: <blank>)
            free
            fixed
            rigid

Command to set properties of the torsion angles that match the
selection <string>. By default, the selection made in the most recent
'angles select' command is used, or all angles if no selection has
been made so far.

The value of a torsion angle can be set with the parameter 'value'. The
<string> is a real number or a real expression that may contain the
symbol 'value' to represent the current value of the torsion angle.
Torsion angle values are given in degrees.

Torsion angles are fixed to their current value if the option 'fixed'
is given. Fixed torsion angles are non-rotatable and cannot be changed
during minimization or torsion angle dynamics.

Torsion angles are made rotatable if the option 'free' is given. Free
torsion angles can be changed during minimization or torsion angle
dynamics.

Initially, all torsion angles defined in the library are rotatable
except for those called OMEGA, which are typically used for the
peptide bonds in polypeptides. OMEGA angles are fixed to 180 degrees
(trans). Optionally, the OMEGA angle preceding a given amino acid
residue can be fixed to 0 degrees (cis) by a preceding the residue
name in the sequence (.seq) file by a lowercase 'c'.
