How can I hide Y column name from bottom of pie-chart ?

Oracle Report 12c - How can I hide Y column name from bottom of pie-chart ?

Grapth Settings:

<rw:graph id="CT_1" src="G_PATRIMONY_SUMMARY2" series="PATRIM_SUMM_DESCRIPTION2" dataValues="PATRIM_SUMM_AMOUNT_CURR2">

<!--

<?xml version="1.0" ?>

<Graph version="11.1.1.0" customLayout="" depthAngle="30" depthRadius="12" pieDepth="50" pieTilt="41" seriesEffect="SE_AUTO_GRADIENT"  seriesTooltipLabelType="TLT_NONE" groupTooltipLabelType="TLT_NONE" alternativeText="" graphType="PIE">

<LegendArea visible="true"/>

<Slice labelPosition="LP_OUTSIDE_WITH_FEELER"/>

<SliceLabel textType="LD_TEXT_PERCENT">

<ViewFormat decimalDigit="2" decimalSeparator="," decimalDigitUsed="true" decimalSeparatorUsed="true" />

</SliceLabel>

<X1Axis majorTickStepAutomatic="true"/>

<Y1Axis majorTickStepAutomatic="true"/>

<Y2Axis majorTickStepAutomatic="true"/>

</Graph>

-->

</rw:graph>