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diff --git a/src/main/java/org/apache/commons/math/DuplicateSampleAbscissaException.java b/src/main/java/org/apache/commons/math/DuplicateSampleAbscissaException.java
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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.commons.math;
+
+import org.apache.commons.math.exception.util.LocalizedFormats;
+
+/**
+ * Exception thrown when a sample contains several entries at the same abscissa.
+ *
+ * @since 1.2
+ * @version $Revision: 983921 $ $Date: 2010-08-10 12:46:06 +0200 (mar. 10 août 2010) $
+ */
+public class DuplicateSampleAbscissaException extends MathException  {
+
+    /** Serializable version identifier */
+    private static final long serialVersionUID = -2271007547170169872L;
+
+    /**
+     * Construct an exception indicating the duplicate abscissa.
+     * @param abscissa duplicate abscissa
+     * @param i1 index of one entry having the duplicate abscissa
+     * @param i2 index of another entry having the duplicate abscissa
+     */
+    public DuplicateSampleAbscissaException(double abscissa, int i1, int i2) {
+        super(LocalizedFormats.DUPLICATED_ABSCISSA,
+              abscissa, i1, i2);
+    }
+
+    /**
+     * Get the duplicate abscissa.
+     * @return duplicate abscissa
+     */
+    public double getDuplicateAbscissa() {
+        return ((Double) getArguments()[0]).doubleValue();
+    }
+
+}