I have been using teylin's excellent solution of the above. It has a great use in the oil & gas industry. I would like to be able to construct lines between various bubbles of my choice, the thickness of which would represent the degree of interdependence between them. The degree of interdependence between bubbles could simply be input numbers off a scale from 1 - 10. I enclose an example of the point that I have reached with this solution.