ls

Input stack	Output stack
TimeSeriesExpr,String,:ls	StyleExpr

Set the line style. The value should be one of:

• line: draw a normal line. This is the default.
• area: fill in the space between the line value and 0 on the Y-axis.
• stack: stack the filled area on to the previous stacked lines on the same axis.
• vspan: non-zero datapoints will be drawn as a vertical span.