You can use the Reference Lines tab (Figure 9.18) to set attributes of reference lines that are displayed in the background of a plot.

Figure 9.18 The Reference Lines Tab

The Reference Lines tab contains the following UI controls:

Style

specifies the style of the line used for reference lines.

Width

specifies the width of the line used for reference lines.

Color

specifies the color of the line used for reference lines.

Show X reference lines

specifies whether to show reference lines for the X axis. These are vertical lines that originate at each tick mark on the X axis.

Show Y reference lines

specifies whether to show reference lines for the Y axis. These are horizontal lines that originate at each tick mark on the Y axis.