Axis const (reference) lines allow you to highlight a value of the scale on the chart walls and the polar radar plot area. You can add an arbitrary number of const lines to the axis by using the "Add" button. The following settings apply to axis const lines:

Visibility - Depending on the axis type the following options are available:

- Cartesian Y Axes

- Show At Back - defines whether the reference line must appear on the back chart wall.

- Show At Side - defines whether the reference line must appear on the side chart wall. This setting is ignored when the chart is operating in 2D mode.

- Cartesian X Axis

- Show At Back - defines whether the reference line must appear on the back chart wall.

- Show At Floor - defines whether the reference line must appear on the floor chart wall. This setting is ignored when the chart is operating in 2D mode.

- Cartesian Depth Axis

- Show At Side - defines whether the reference line must appear on the side chart wall. This setting is ignored when the chart is operating in 2D mode.

- Show At Floor - defines whether the reference line must appear on the floor chart wall. This setting is ignored when the chart is operating in 2D mode.

- Polar / Radar Axis

- Show - defines whether the reference line must appear on the chart polar / radar plot area.

Value- controls the value of the reference line. You can enter any numeric / date time value which will be parsed.

Text - controls the text displayed at the const line.

Text Offset X and Text Offset Y - control the text offset relative to the origin point of the text selected by text alignment.

Text Alignment - controls the position of the text relative to the const line.

Stroke Style - invokes the stroke style dialog allowing you to modify the stroke of the reference line.