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If you want to create a column stacked chart with connecting lines, set the value of the lineToEachItems attribute to "true", and create the <lineStroke> element tag to set the color and thickness of the connecting line.

...
<Column2DChart showDataTips="true">
'''
  <series>
    <Column2DSet type="stacked" showTotalLabel="true" labelYOffset="-5">	
      <series>
        <Column2DSeries yField="iPhone" displayName="iPhone" lineToEachItems="true" showLinkLabels="true" >
          <lineStroke>
            <Stroke weight="1" color="0xE48701" caps="none"/>
          </lineStroke>
        </Column2DSeries>
        ...
      </series>
    </Column2DSet>
  </series>
</Column2DChart>
...

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