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diff --git a/examples/spectrum/spectrumapp/frequencyspectrum.h b/examples/spectrum/spectrumapp/frequencyspectrum.h
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--- a/examples/spectrum/spectrumapp/frequencyspectrum.h
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-/****************************************************************************
-**
-** Copyright (C) 2013 Digia Plc
-** All rights reserved.
-** For any questions to Digia, please use contact form at http://qt.digia.com
-**
-** This file is part of the QtDataVis3D module.
-**
-** Licensees holding valid Qt Enterprise licenses may use this file in
-** accordance with the Qt Enterprise License Agreement provided with the
-** Software or, alternatively, in accordance with the terms contained in
-** a written agreement between you and Digia.
-**
-** If you have questions regarding the use of this file, please use
-** contact form at http://qt.digia.com
-**
-****************************************************************************/
-
-#ifndef FREQUENCYSPECTRUM_H
-#define FREQUENCYSPECTRUM_H
-
-#include <QtCore/QVector>
-
-/**
- * Represents a frequency spectrum as a series of elements, each of which
- * consists of a frequency, an amplitude and a phase.
- */
-class FrequencySpectrum {
-public:
-    FrequencySpectrum(int numPoints = 0);
-
-    struct Element {
-        Element()
-        :   frequency(0.0), amplitude(0.0), phase(0.0), clipped(false)
-        { }
-
-        /**
-         * Frequency in Hertz
-         */
-        qreal frequency;
-
-        /**
-         * Amplitude in range [0.0, 1.0]
-         */
-        qreal amplitude;
-
-        /**
-         * Phase in range [0.0, 2*PI]
-         */
-        qreal phase;
-
-        /**
-         * Indicates whether value has been clipped during spectrum analysis
-         */
-        bool clipped;
-    };
-
-    typedef QVector<Element>::iterator iterator;
-    typedef QVector<Element>::const_iterator const_iterator;
-
-    void reset();
-
-    int count() const;
-    Element& operator[](int index);
-    const Element& operator[](int index) const;
-    iterator begin();
-    iterator end();
-    const_iterator begin() const;
-    const_iterator end() const;
-
-private:
-    QVector<Element> m_elements;
-
-};
-
-#endif // FREQUENCYSPECTRUM_H