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"
    ]




    "francisfang_seu@163.com" -- "fqafrancis@sjtu.edu.cn" [label=" 27 ", penwidth="10", color="#00688bFF"];
    "francisfang_seu@163.com" -- "wk_chen96@foxmail.com" [label=" 17 ", penwidth="6", color="#00688bB7"];
    "fangqianan.fqa@alibaba-inc.com" -- "francisfang_seu@163.com" [label=" 15 ", penwidth="5", color="#00688bA5"];
    "fqafrancis@sjtu.edu.cn" -- "wk_chen96@foxmail.com" [label=" 13 ", penwidth="4", color="#00688b93"];
    "fangqianan.fqa@alibaba-inc.com" -- "fqafrancis@sjtu.edu.cn" [label=" 12 ", penwidth="4", color="#00688b93"];
    "fangqianan.fqa@alibaba-inc.com" -- "wk_chen96@foxmail.com" [label=" 12 ", penwidth="4", color="#00688b93"];

}