In addition to the ID, X, and Y columns, the LABEL column is added to label the
polygons in the output. Notice that the observations for each ID value are grouped
together in the data set. The observations for each ID must occur contiguously in the
data. Otherwise, unexpected results might occur.
The following figure shows how the polygons are drawn from this data. Reference lines
are provided to help you locate the polygon points in the output.
The polygons are drawn in the order in which they appear in the data: rectangle (ID=1),
triangle (ID=2), and polygon (ID=3). The red ...
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