# Reference Lines

The Reference Lines dialog may vary slightly in appearance depending on the kind of chart that is used. A reference line is a line intersecting the chart plot area from a given point on one or both axes. It may be used, for example, to indicate a certain level or percentiles of chart data. The reference line is only drawn if it falls within the current range of the axis from which it origins.

Reference line properties

| Property | Description |
| --- | --- |
| Label | Enter a label to be drawn next to the reference line. The default value used is the expression. The label may be defined as a calculated expression. |
| Show Label in Chart | Enable this setting if the label should appear next to the reference line. |
| Location | Sets from which axis the reference line should originate:<br>Continuous X<br>The reference line originates from the x-axis. This option is only available if the chart has a continuous x-axis.<br>Primary Y<br>The reference line originates from the primary y-axis (left/bottom).<br>Secondary Y<br>The reference line originates from the secondary y-axis (right/top). |
| Definition | Sets the<br>value at which the reference line should be drawn. The value<br>be either a fixed Percentile (enter<br>a value between 1 and 100 in the edit box) of the current chart data or<br>an arbitrary numeric Expression. |
| Line Formatting | Defines the layout of the reference line:<br>Weight<br>Specifies the weight of the reference line. The value can be specified in mm, cm, inches (", inch), pixels (px, pxl, pixel), points (pt, pts, point) or docunits (du, docunit).<br>Color<br>Sets the color for the reference line.<br>Style<br>Specifies the style for the reference line, for example, continuous, dashed or dotted. |
| Show | Specifies the condition for displaying the reference line.<br>Always<br>The reference line will always be displayed.<br>Conditional<br>The reference line will be displayed or hidden depending on a conditional expression which will be evaluated each time the chart is to be drawn. The reference line will only be visible when the expression returns true. |