[BioC] Rgraphviz - how to use node positions from one graph as node positions in another?

[Søren Højsgaard]

Dear list,
 
I create a "graphNEL" graph with a neato layout. I would like to get the locations of nodes in that graph and use these locations when creating subsequent graphs (such that all the graphs have the nodes in the same locations). How can this be achieved?? Apologies if this issue has come op on the list, but I haven't found it...
 
Thanks in advance
Søren