How to force Y coordinate in graphviz

问题

Is there a way to force y position, in pixel or inche, in graphviz using dot.

The rank=same is not suitable for my case.

The [pos="x,y!"] with -Kfdp could be a way, but I want to let GraphViz determines the X position.

Thanks

来源：https://stackoverflow.com/questions/13101802/how-to-force-y-coordinate-in-graphviz