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1. Gradient Style/Type:

JFreeChart engine cannot currently implement more than one gradient type except when it's none. For example:
       *    series1: -x-pentaho-chart-gradient-type: none
       *    series2: -x-pentaho-chart-gradient-type: VERTICAL
       *    series3: -x-pentaho-chart-gradient-type: none
       *    series4: -x-pentaho-chart-gradient-type: HORIZONTAL 
       *    series5: -x-pentaho-chart-gradient-type: CENTER_HORIZONTAL 
       *    series6: -x-pentaho-chart-gradient-type: none

JfreeChart can render none as none, but can implement only one of the correct gradient styles (defined for series# 2,4,5). In our plugin implementation for JFreeChart we are accepting none as none. But for the series tags with non-none and correct gradient types defined, we accept the first not-none gradient type and then render the rest of the series with correct gradient types with that.
 
For example: we would render the series described above as:

* series1; none
* series2; VERTICAL
* series3; none
* series4; VERTICAL
* series5; VERTICAL
* series6: none

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