RIBBON
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## RIBBON

### Description

Level: 3rd, 4th, or 5th

A ribbon. A ribbon is drawn with a smoothly curved plane. Thickness of the plane is also changeable.

### Parent Elements

GLOBAL, LOCAL, CHAIN

### Child Elements

nothing

### Attributes

See also the common attributes for primitives. Most options such as radius, color are described there.

init (type:Int) , last (type:Int)

  Initial and last index in chain. The "last" value must be bigger than "init", and the POINT having the values init-last must exist. See POINT element for further information. These value are ignored in LOCAL and GLOBAL, but are REQUIRED in CHAIN.

thickness (abbr.:thick) (type:Float) = "0.0"

  Thickness of the ribbons. (This setting is also valid in LOCAL and GLOBAL)

smoothing (abbr.:smooth) (type:Int) = "0"

  Whether smoothing of the ribbon is enbaled(>1) or not(0). This parameter aims for drawing smooth beta-strands. Do not use this for alpha-helices or coils.

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