title: How to set fix node positions with ggnet2
body: <p>I am using ggnet2 to visualize networks and I was wondering whether anyone is aware of a way to fix the node positions as it is possible with e.g. igraph (as explained e.g. here <a href="https://stackoverflow.com/questions/5364264/how-to-control-the-igraph-plot-layout-with-fixed-positions">How to control the igraph plot layout with Fixed Positions?</a>)</p>
  
  <p>Thanks,
  Chris</p>