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<esri:ClassBreaksRenderer x:Key="MyClassBreaksRenderer" Field="total_amt">
<esri:ClassBreaksRenderer.Classes>
<esri:ClassBreakInfo MinimumValue="0" MaximumValue="50" Symbol="{StaticResource LowFillSymbol}" Label="$0 - $50" />
<esri:ClassBreakInfo MinimumValue="50" MaximumValue="100" Symbol="{StaticResource MediumFillSymbol}" Label="$50 - $100" />
<esri:ClassBreakInfo MinimumValue="100" MaximumValue="1000000" Symbol="{StaticResource HighFillSymbol}" Label="$100+" />
</esri:ClassBreaksRenderer.Classes>
</esri:ClassBreaksRenderer>