penwidth
Specifies the width of the pen, in points, used to draw lines and curves
type: double, default: 1.0, minimum: 0.0
including the boundaries of edges and clusters.
penwidth value is inherited by subclusters, and has no effect on text.
Previous to 31 January 2008, the effect of penwidth=W was achieved by
including setlinewidth(W) as part of a style specification.
If both attributes are set, penwidth will be used.
- Clusters
- Nodes
- Edges