You can
use ODS Graphics Editor to add the following annotation objects to
a graph:
text annotations
lines and arrows
ovals (and circles)
rectangles (and squares)
markers
images
The annotation
objects are rendered on top of the graph. Unlike titles and footnotes,
annotation objects do not cause a graph to be resized or rearranged.
Annotation
objects can be attached to a graph data points. If the graph is resized,
the annotations move with the data point. For more information,
see Understanding Annotation Objects and Data.