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diff --git a/gcov/org.eclipse.linuxtools.dataviewers.charts/src/org/eclipse/linuxtools/dataviewers/charts/provider/IChartField.java b/gcov/org.eclipse.linuxtools.dataviewers.charts/src/org/eclipse/linuxtools/dataviewers/charts/provider/IChartField.java
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+++ b/gcov/org.eclipse.linuxtools.dataviewers.charts/src/org/eclipse/linuxtools/dataviewers/charts/provider/IChartField.java
@@ -0,0 +1,30 @@
+/*******************************************************************************
+ * Copyright (c) 2009 STMicroelectronics.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *    Marzia Maugeri <marzia.maugeri@st.com> - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.linuxtools.dataviewers.charts.provider;
+
+import org.eclipse.linuxtools.dataviewers.abstractviewers.ISTDataViewersField;
+
+/**
+ * The interface used by the charts to get a <code>Number</code> data from a field.
+ * 
+ * @author Marzia Maugeri <marzia.maugeri@st.com>
+ *
+ */
+public interface IChartField extends ISTDataViewersField {
+	
+	/**
+	 * Returns the number to display in the chart for this object.
+	 * 
+	 * @param obj
+	 * @return the corresponding number value
+	 */
+	public Number getNumber(Object obj);
+}