Series options.
Use setSeriesOptions method to set a values

Option name	Type	Default
stack	Mixed	null
This option allows grouping series in a stacked chart. The stack option can be a string or a number or anything else, as long as the grouped series' stack options match each other.
type	String	"line"
"line" The type of series. Can be one of area, areaspline, bar, column, line, pie, scatter or spline.
xAxis	Number	0
When using dual or multiple x axes, this number defines which xAxis the particular series is connected to. It refers to the index of the axis in the xAxis array, with 0 being the first.
yAxis	Number	0
When using dual or multiple y axes, this number defines which yAxis the particular series is connected to. It refers to the index of the axis in the yAxis array, with 0 being the first.