digraph EFA {
  graph [ rankdir = TB ];
  factor1;
  factor2;
  var1[shape=box];
  var2[shape=box];
  var3[shape=box];
  var4[shape=box];
  var5[shape=box];
  var6[shape=box];
  e1[shape=none];
  e2[shape=none];
  e3[shape=none];
  e4[shape=none];
  e5[shape=none];
  e6[shape=none];
  factor1 -> var1;
  factor1 -> var2;
  factor1 -> var3;
  factor1 -> var4;
  factor1 -> var5;
  factor1 -> var6;
  factor2 -> var1;
  factor2 -> var2;
  factor2 -> var3;
  factor2 -> var4;
  factor2 -> var5;
  factor2 -> var6;
  e1 -> var1
  e2 -> var2
  e3 -> var3
  e4 -> var4
  e5 -> var5
  e6 -> var6
  { rank = same; factor1; factor2; }
  { rank = same; var1; var2; var3; var4; var5; var6; }
  { rank = same; e1; e2; e3; e4; e5; e6; }
  { rank = max; e1; e2; e3; e4; e5; e6; }
}