ns, the graphics system uses the extra bit to allow for coordinates that are described in terms of &quot;parameters.&quot;
<IMG SRC="Shapes_e_paramRegion.gif">

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When you create a region you can specify coordinates as an offset from a <EM>
parameter</EM>
. When the region is initialized, up to four parameters may be defined. Coordinates may then be specified as 13-bit offsets from any one of these four parameters. When drawing the construct, new values may be passed for the parameters. In this way, 