digraph config {

        node [shape=record fontsize=12 fontname="Arial"];
        edge [fontname = "Arial" fontsize = 10 dir=back]


        ObsConfig [fillcolor=dodgerblue3, fontcolor=white, style=filled]
        SubarrayConfig [fillcolor=dodgerblue3, fontcolor=white, style=filled] 
        ArrayTriggerConfig [fillcolor=goldenrod4,
                            fontcolor=white, style=filled]
        TelescopeTriggerConfig [fillcolor=goldenrod4,
                                fontcolor=white, style=filled]

        ObsConfig -> SubarrayConfig [label="obs_id"];
        ObsConfig -> ArrayTriggerConfig [label="run_type"];
        ArrayTriggerConfig -> TelescopeTriggerConfig [label="run_type,\ntel_id"];       
        SubarrayConfig -> ArrayConfig [label="site_id,\nversion"]      
        ArrayConfig -> TelescopeConfig [label="tel_id"];
        TelescopeConfig -> CameraConfig [label="tel_id"];
        TelescopeConfig -> OpticsConfig [label="tel_id"];


}