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The background image in the chart can be set by creating the <Image> element tag as a child node of the <backgroundElements> element tag.

...
  <backgroundElements>
    <Image source="http://www.koolchart.com/images/background.jpg" maintainAspectRatio="false" alpha="1">
  </backgroundElements>    
...

<Image>

source The source attribute is to set the URL path of the image file.
maintainAspectRatio The maintainAspectRatio attribute determines whether or not to preserve the original aspect ratio of the image.
alpha The alpha attribute is to set the transparency of the image.

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