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"
    ]




    "parquet" -- "parquet" [label=" 3 ", penwidth="3", color="#a0a0a082"];
    "arrow-avro" -- "arrow-avro" [label=" 1 ", penwidth="1", color="#a0a0a05E"];
    "arrow-buffer" -- "arrow-buffer" [label=" 1 ", penwidth="1", color="#a0a0a05E"];
    "arrow-ipc" -- "arrow-ipc" [label=" 1 ", penwidth="1", color="#a0a0a05E"];

}