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To draw a dashed line in the line chart, you must set the value of the lineStyle attribute to "dashLine" in the <Line2DSeries> element tag.

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<Line2DSeries ... lineStyle="dashLine" dashLinePattern="4" ... >
  ...
</Line2DSeries>
...
lineStyle The lineStyle attribute determines the line style. The valid values are "normal" and "dashLine". The default value is "normal".
dashLinePattern The dashLinePattern attribute determines the dash length. e.g. If you set the value to 5, then the 5 pixels of the dash and the 5 pixels of the space will be repeated. The larger the value, the better performance you can have.

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