SheetXL - v1.0.2
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    Type Alias MarkerSymbol

    MarkerSymbol:
        | "automatic"
        | "none"
        | "square"
        | "diamond"
        | "triangle"
        | "x"
        | "star"
        | "dot"
        | "dash"
        | "circle"
        | "plus"

    What a marker is drawn as; 'automatic' lets the series' place in the chart choose.