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diff --git a/src/main/java/org/apache/commons/math3/optimization/Target.java b/src/main/java/org/apache/commons/math3/optimization/Target.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.math3.optimization;
+
+/**
+ * Target of the optimization procedure. They are the values which the objective vector function
+ * must reproduce When the parameters of the model have been optimized. <br>
+ * Immutable class.
+ *
+ * @deprecated As of 3.1 (to be removed in 4.0).
+ * @since 3.1
+ */
+@Deprecated
+public class Target implements OptimizationData {
+    /** Target values (of the objective vector function). */
+    private final double[] target;
+
+    /**
+     * @param observations Target values.
+     */
+    public Target(double[] observations) {
+        target = observations.clone();
+    }
+
+    /**
+     * Gets the initial guess.
+     *
+     * @return the initial guess.
+     */
+    public double[] getTarget() {
+        return target.clone();
+    }
+}