Reference lines are horizontal or vertical lines that span the data region of a graph to designate goals or demarcations. For example, the reference line on this bar chart of monthly sales represents sales quotas.
You must use the scale units on the graph to position the reference lines. For example, if the y-scale has been transformed so that the tick marks are displayed in transformed units, you must enter the reference line position in the transformed units.
To add a reference line when you create a graph, click Scale. To add a reference line to an existing graph, click the graph and choose . To edit a reference line, double-click it. On the Attributes tab, you can change the color, size, or line type.
To edit the label for a reference line, double-click the label. On the Font tab, you can change the text, size, color, style, or font. On the Show tab, you can hide the label or move it to the other side of the graph. On the Alignment tab, you can change the following.
Rotate the label, for example to make adjacent labels easier to read.