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The font size of axis labels can be set using the styleName attribute in the AxisRenderer element tags ( e.g. <Axis2DRenderer>, <Axis3DRenderer> ).

The CSS styles must be defined in the <Style> element tag which is normally defined at the end of the layout ( just before </KoolChart> ). The name which is set to the value of the styleName attribute begins with the dot ( . ) character and is followed by the curly braces which contain CSS attributes and values.

...
<Column2DChart ...  >
'''
...
  <verticalAxisRenderers ... >
    <Axis2DRenderer axis="{vAxis}" styleName="axisLabel" > 
  </verticalAxisRenderers>
  <horizontalAxisRenderers ... >
    <Axis2DRenderer axis="{hAxis}" styleName="axisLabel" showLine="true" > 
  </horizontalAxisRenderers>
</Column2DChart>
<Style>>.axisLabel{fontSize:11;}
</Style>
...

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