NAME
     TypeRibbon - set type of ribbons

SYNOPSIS
     TypeRibbon ( interpol | smooth | as_is )
	 ( free | cylinder | spacing | neighbour | as_is )

DESCRIPTION
     Set the type of all selected ribbons. The first
     argument determines whether the ribbon goes through
     the atoms used for AddRibbon, or whether it is
     smoothed. The second argument determines how the
     ribbon is oriented.

     Typically interpol/cylinder or interpol/spacing is
     used for helices, smooth/neighbour for sheets and
     smooth/free for turns and random coil.

     'cylinder' does a least square fit of a cylinder
     surface to the atoms, 'spacing' fits a cylinder so
     that the spacing of atoms along the axis is as
     regular as possible. The results are very similar
     in most cases, but 'spacing' often looks better
     for very short helices or DNA.

     The information about which residue is the neighbour
     of which other residue is read from the secondary
     structure information in PDB files or calculated by
     the CalcSecondary command. It can also be set with
     the SetNeigh command.

     For both arguments, the value 'as_is' will leave the
     value unchanged, this is useful when one wants to
     change one of the values for multiple ribbons at once.

EXAMPLE
     TypeRibbon smooth neighbour

SEE ALSO
     ReadPdb, CalcSecondary, SetNeigh,
     AddRibbon, SelectPrim, LengthPrim,
     StyleRibbon, SizeRibbon, PaintRibbon

DATE
     950307
