The column names, in order.
How many data points the series holds.
The category name at index.
Measured: the category axis' label on a category axis, and the empty string on a value axis -- so an empty name means "this axis carries numbers", not "this point is unnamed".
The value of one dimension at index.
On a category axis this is the category's index, not its name; the name comes from getName.
OptionaltreeThe hierarchy, on a treemap, sunburst or tree series.
OptionalgraphThe graph, on a sankey or graph series.
A series' data list.
Addressed by index rather than iterated, which is what lets a reading walk it in the order the chart drew it.