OptionalaxisOptionalbubbleOptionalbubbleOptionalbubbleOptionalchartOptionaldataOptionalexplosionOptionalformulaOptionalgapOptionalinvertOptionalmarkerOptionalnameOptionaloverlapOptionalplotOptionalsecondOptionalsecondOptionalshowOptionalsmoothOptionalsplitSet before splitValue, as Excel's two writes are.
OptionalsplitOptionalstyleOptionalvaluesOptionalvaryOptionalx
What IChart.ISeries.update sets; each field as its setter takes it.