digraph structs { node [shape=plaintext]; struct1 [label=<<TABLE> <TR><TD><IMG SRC="eqn.png"/></TD></TR> <TR><TD>caption</TD></TR> </TABLE>>]; }
digraph structs { node [shape=plaintext]; struct1 [label=<<TABLE> <TR><TD><IMG SRC="eqn.png"/></TD></TR> <TR><TD>caption</TD></TR> </TABLE>>]; }