A long expression that specifies the width (in pixels) of the links between nodes.
By default, the PenWidthLink property is 1. Use the
PenWidthLink property to specify the thickness of
the lines between nodes. Use the PenLink
property to specify the type of the pen used to paint the lines between nodes.
By default, the PenWidthLinks property is 1. The LinkColor
property specifies the color of the links between nodes.
