The 'subtitle' property

Character Vector

Valid for: Chart

The subtitle property is one of three labels which you can associate with a Chart (the others are title and note). It is displayed just below the title, in a slightly smaller font, and is intended as a sub-title for the whole chart. However, you can use it in any way you wish, or omit it altogether by leaving it as an empty vector.

You can specify the position, color and font of the displayed text by using the placetitle, colortitle and fonttitle properties.