diff --git a/Classes/PHPExcel/Writer/Excel2007/Chart.php b/Classes/PHPExcel/Writer/Excel2007/Chart.php
index 286e97c..3e5c350 100644
--- a/Classes/PHPExcel/Writer/Excel2007/Chart.php
+++ b/Classes/PHPExcel/Writer/Excel2007/Chart.php
@@ -83,7 +83,12 @@ class PHPExcel_Writer_Excel2007_Chart extends PHPExcel_Writer_Excel2007_WriterPa
 					$objWriter->writeAttribute('val', 0);
 				$objWriter->endElement();
 
-				$this->_writePlotArea($pChart->getPlotArea(), $pChart->getXAxisLabel(), $pChart->getYAxisLabel(), $objWriter);
+				$this->_writePlotArea($pChart->getPlotArea(),
+									  $pChart->getXAxisLabel(),
+									  $pChart->getYAxisLabel(),
+									  $objWriter,
+									  $pChart->getWorksheet()
+									 );
 
 				$this->_writeLegend($pChart->getLegend(), $objWriter);
 
@@ -217,7 +222,8 @@ class PHPExcel_Writer_Excel2007_Chart extends PHPExcel_Writer_Excel2007_WriterPa
 	private function _writePlotArea(PHPExcel_Chart_PlotArea $plotArea,
 									PHPExcel_Chart_Title $xAxisLabel = NULL,
 									PHPExcel_Chart_Title $yAxisLabel = NULL,
-									$objWriter)
+									$objWriter,
+									PHPExcel_Worksheet $pSheet)
 	{
 		if (is_null($plotArea)) {
 			return;
@@ -252,7 +258,7 @@ class PHPExcel_Writer_Excel2007_Chart extends PHPExcel_Writer_Excel2007_WriterPa
 								$objWriter->endElement();
 							}
 
-							$this->_writePlotGroup($plotGroup, $chartType, $objWriter, $catIsMultiLevelSeries, $valIsMultiLevelSeries, $plotGroupingType);
+							$this->_writePlotGroup($plotGroup, $chartType, $objWriter, $catIsMultiLevelSeries, $valIsMultiLevelSeries, $plotGroupingType, $pSheet);
 						}
 					}
 
@@ -664,9 +670,17 @@ class PHPExcel_Writer_Excel2007_Chart extends PHPExcel_Writer_Excel2007_WriterPa
 	 * @param	boolean							&$catIsMultiLevelSeries	Is category a multi-series category
 	 * @param	boolean							&$valIsMultiLevelSeries	Is value set a multi-series set
 	 * @param	string							&$plotGroupingType		Type of grouping for multi-series values
+	 * @param	PHPExcel_Worksheet 				$pSheet
 	 * @throws 	Exception
 	 */
-	private function _writePlotGroup($plotGroup, $groupType, $objWriter, &$catIsMultiLevelSeries, &$valIsMultiLevelSeries, &$plotGroupingType)
+	private function _writePlotGroup( $plotGroup,
+									  $groupType,
+									  $objWriter,
+									  &$catIsMultiLevelSeries,
+									  &$valIsMultiLevelSeries,
+									  &$plotGroupingType,
+									  PHPExcel_Worksheet $pSheet
+									)
 	{
 		if (is_null($plotGroup)) {
 			return;
@@ -815,7 +829,7 @@ class PHPExcel_Writer_Excel2007_Chart extends PHPExcel_Writer_Excel2007_WriterPa
 						$objWriter->startElement('c:cat');
 					}
 
-						$this->_writePlotSeriesValues($plotSeriesCategory, $objWriter, $groupType, 'str');
+						$this->_writePlotSeriesValues($plotSeriesCategory, $objWriter, $groupType, 'str', $pSheet);
 					$objWriter->endElement();
 				}
 
@@ -830,7 +844,7 @@ class PHPExcel_Writer_Excel2007_Chart extends PHPExcel_Writer_Excel2007_WriterPa
 						$objWriter->startElement('c:val');
 					}
 
-						$this->_writePlotSeriesValues($plotSeriesValues, $objWriter, $groupType, 'num');
+						$this->_writePlotSeriesValues($plotSeriesValues, $objWriter, $groupType, 'num', $pSheet);
 					$objWriter->endElement();
 				}
 
@@ -885,9 +899,15 @@ class PHPExcel_Writer_Excel2007_Chart extends PHPExcel_Writer_Excel2007_WriterPa
 	 * @param 	PHPExcel_Shared_XMLWriter 			$objWriter 			XML Writer
 	 * @param	string								$groupType			Type of plot for dataseries
 	 * @param	string								$dataType			Datatype of series values
+	 * @param	PHPExcel_Worksheet 					$pSheet
 	 * @throws 	Exception
 	 */
-	private function _writePlotSeriesValues($plotSeriesValues, $objWriter, $groupType, $dataType='str')
+	private function _writePlotSeriesValues( $plotSeriesValues,
+											 $objWriter,
+											 $groupType,
+											 $dataType='str',
+											 PHPExcel_Worksheet $pSheet
+										   )
 	{
 		if (is_null($plotSeriesValues)) {
 			return;
@@ -956,7 +976,13 @@ class PHPExcel_Writer_Excel2007_Chart extends PHPExcel_Writer_Excel2007_WriterPa
 					$dataValues = $plotSeriesValues->getDataValues();
 					if (!empty($dataValues)) {
 						if (!is_array($dataValues)) {
-							var_dump($dataValues);
+							$dataValues = PHPExcel_Calculation_Functions::flattenArray(
+								PHPExcel_Calculation::getInstance()
+								    ->calculateFormula('='.$dataValues,
+								    	NULL,
+								    	$pSheet->getCell('A1')
+								    )
+							);
 						}
 						if (is_array($dataValues)) {
 							foreach($dataValues as $plotSeriesKey => $plotSeriesValue) {