BaseDimension is a double precision value that sets "normal" pane size on
which all the settings are based. The BaseDimension is in inches. For
example, if the BaseDimension is 8.0 inches and the
Title size is 14 points. Then the pane title font
will be 14 points high when the Rect is approximately 8.0
inches wide. If the Rect is 4.0 inches wide, the pane title font will be
7 points high. Most features of the graph are scaled in this manner.
The base dimension reference for the Rect, in inches
