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A wing chart ( or tornado chart ) is a special type of column chart ( or bar chart ), where two columns ( or bars ) are spread over both sides of the axis. The wing chart is useful to compare two categories of data and to provide decision makers with a quick overview.

The <Column2DWingChart> element tag is used to create a column-type wing chart in KoolChart, and the series element tag for the column-type wing chart is <Column2DWingSeries>.

...
<Column2DWingChart ... >
  ...
  <series>
    <Column2DWingSeries yField="sales1" yFieldOpp="sales2" ... >
      ...
    </Column2DWingSeries>
  </series>
  ...
</Column2DWingChart>
...

<Column2DWingSeries>

yField The yField attribute determines the field name of the upper wing of the vertical axis ( verticalAxis ).
yFieldOpp The yFieldOpp attribute determines the field name of the lower wing of the vertical axis ( verticalAxis ).

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