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"
    ]




    "sjtu_zhangwh@163.com" -- "wenhaozhang@microsoft.com" [label=" 149 ", penwidth="10", color="#00688bFF"];
    "haozhangms@outlook.com" -- "haozhan@microsoft.com" [label=" 45 ", penwidth="3", color="#00688b82"];
    "zephon.zh@gmail.com" -- "wenhaozhang@microsoft.com" [label=" 32 ", penwidth="2", color="#00688b70"];
    "haozhangms@outlook.com" -- "wenhaozhang@microsoft.com" [label=" 32 ", penwidth="2", color="#00688b70"];
    "haozhan@microsoft.com" -- "wenhaozhang@microsoft.com" [label=" 32 ", penwidth="2", color="#00688b70"];
    "haozhangms@outlook.com" -- "sjtu_zhangwh@163.com" [label=" 23 ", penwidth="1", color="#00688b5E"];
    "haozhan@microsoft.com" -- "sjtu_zhangwh@163.com" [label=" 23 ", penwidth="1", color="#00688b5E"];
    "haozhangms@outlook.com" -- "zephon.zh@gmail.com" [label=" 13 ", penwidth="1", color="#00688b4C"];
    "haozhan@microsoft.com" -- "zephon.zh@gmail.com" [label=" 13 ", penwidth="1", color="#00688b4C"];
    "zephon.zh@gmail.com" -- "sjtu_zhangwh@163.com" [label=" 10 ", penwidth="1", color="#00688b4C"];

}