graph G {
    compound="true"
    rankdir="TB"
    bgcolor="white"
    fontname="Tahoma"

    node [
        fixedsize="false"
        fontname="Tahoma"
        color="white"
        fillcolor="deepskyblue2"
        fontcolor="black"
        shape="box"
        style="filled"
        penwidth="1.0"
    ]
    edge [
        fontname="Arial"
        color="#00688b"
        fontcolor="black"
        fontsize="12"
        arrowsize="0.5"
        penwidth="1.0"
    ]




    "[of.c]" -- "[core.c]" [label=" 69 ", penwidth="10", color="#00688bFF"];
    "[opp.h]" -- "[core.c]" [label=" 51 ", penwidth="7", color="#00688bC9"];
    "[opp.h]" -- "[of.c]" [label=" 18 ", penwidth="2", color="#00688b70"];
    "[cpu.c]" -- "[opp.h]" [label=" 2 ", penwidth="1", color="#00688b4C"];
    "[cpu.c]" -- "[core.c]" [label=" 2 ", penwidth="1", color="#00688b4C"];
    "[cpu.c]" -- "[of.c]" [label=" 2 ", penwidth="1", color="#00688b4C"];

}