numeric
Details of which entity lugs are to be displayed when the member entity.lugs is set. Possible values of lug_style are:
0 - Show a lug at the center point of the node (node.pt).
When a lug is picked interactively (via the luglock function) the possible values of the system numeric lug_index on a successful hit are:
0 - The center point of the node.
New node primitives have a lug_style of 0.
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 Functions:  | 
 luglock (point)  | 
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 Identifiers:  | 
 lug_index (numeric)  |