3.2.3.1.6 Chart formulas
Chart formulas define data ranges and values used by charts, such as chart ranges, series ranges, series titles, and axis titles.
A chart formula shall be either a 3-D reference or a constant.
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chart-formula= chart_ref | "(", chart-ref, ",", chart-ref, {",", chart-ref}, ")" chart_ref = external-cell-reference | external-name ;