var mirror_track = function (div) {

    var board = tnt.board().min(0).max(500).from(0).to(500).width(950);

    // Axis track
    var axis_track = tnt.board.track()
        .height(0)
        .color("white")
        .display(tnt.board.track.feature.axis()
             .orientation("top")
        );

    // Mirror track -- mirrors the data in the data track below
    var mirror_track = tnt.board.track()
        .height(60)
        .color("white")
        .display(tnt.board.track.feature.pin()
            .domain([0.3, 1.2])
            .color("blue")
        ); // No data defined for this track -- will use the data in pin_track

    // Data track1
    var pin_track = tnt.board.track()
        .height(60)
        .color("white")
        .display(tnt.board.track.feature.pin()
            .domain([0.3, 1.2])
            .color("red")
        )
        .data(tnt.board.track.data.sync()
            .retriever (function () {
                // Data may be comming from a remote resource via tnt.board.track.data.async
                var data = [
                    {
                        pos : 200,
                        val : 0.5,
                        label : "1"
                    },
                    {
                        pos : 355,
                        val : 0.8,
                        label : "2"
                    },
                    {
                        pos : 100,
                        val : 0.3,
                        label : "3"
                    },
                    {
                        pos : 400,
                        val : 1,
                        label : "4"
                    }
                ];

                var mirror_data = mirror_track.data(); // tnt.board.track.data.empty by default
                mirror_data.elements (data);
                mirror_track.display().update.call(mirror_track);

                return data;
            })
        );


    board
        .add_track([axis_track, pin_track, mirror_track]);

    board(div);

    board.start();
};