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

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




    "jinyu.fjy@gmail.com" -- "niklas.sm+github@gmail.com" [label=" 7 ", penwidth="7", color="#00688bC9"];
    "jinyu.fjy@gmail.com" -- "zena.kamel100@gmail.com" [label=" 7 ", penwidth="7", color="#00688bC9"];
    "jinyu.fjy@gmail.com" -- "jinyu_feng@mfe.berkeley.edu" [label=" 3 ", penwidth="3", color="#00688b82"];

}