For example, with the suggested input graph, dot in.gv produces a very different drawing than
dot in.gv | dot | dot | dot | dot
This means that applications wishing to run dot multiple times must keep track of any original width and height settings and restore them before calling dot.
From another viewpoint, the fixedsize attribute does not work as specified
since the size of the resulting node will be bigger than specified by the
width and height parameters, even if fixedsize=true.
a [shape=box, peripheries=5]