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diff --git a/gr-qtgui/lib/FrequencyDisplayPlot.h b/gr-qtgui/lib/FrequencyDisplayPlot.h
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+++ b/gr-qtgui/lib/FrequencyDisplayPlot.h
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+/* -*- c++ -*- */
+/*
+ * Copyright 2008,2009,2010,2011 Free Software Foundation, Inc.
+ * 
+ * This file is part of GNU Radio
+ * 
+ * GNU Radio is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3, or (at your option)
+ * any later version.
+ * 
+ * GNU Radio is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Radio; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef FREQUENCY_DISPLAY_PLOT_HPP
+#define FREQUENCY_DISPLAY_PLOT_HPP
+
+#include <stdint.h>
+#include <cstdio>
+#include <qwt_plot.h>
+#include <qwt_painter.h>
+#include <qwt_plot_canvas.h>
+#include <qwt_plot_curve.h>
+#include <qwt_scale_engine.h>
+#include <qwt_scale_widget.h>
+#include <qwt_plot_zoomer.h>
+#include <qwt_plot_panner.h>
+#include <qwt_plot_marker.h>
+#include <qwt_plot_magnifier.h>
+#include <highResTimeFunctions.h>
+#include <qwt_symbol.h>
+#include <qtgui_util.h>
+
+class FrequencyDisplayPlot:public QwtPlot{
+  Q_OBJECT
+
+public:
+  FrequencyDisplayPlot(QWidget*);
+  virtual ~FrequencyDisplayPlot();
+
+  void SetFrequencyRange(const double, const double, 
+			 const double, const bool,
+			 const double units=1000.0, 
+			 const std::string &strunits = "kHz");
+  double GetStartFrequency()const;
+  double GetStopFrequency()const;
+
+  void PlotNewData(const double* dataPoints, const int64_t numDataPoints,
+		   const double noiseFloorAmplitude, const double peakFrequency,
+		   const double peakAmplitude, const double timeInterval);
+  
+  void ClearMaxData();
+  void ClearMinData();
+  
+  void SetMaxFFTVisible(const bool);
+  void SetMinFFTVisible(const bool);
+				   
+  virtual void replot();
+
+  void set_yaxis(double min, double max);
+
+  void SetTraceColour (QColor);
+  void SetBGColour (QColor c);
+  void ShowCFMarker (const bool);
+
+public slots:
+  void resizeSlot( QSize *e );
+  void SetLowerIntensityLevel(const double);
+  void SetUpperIntensityLevel(const double);
+
+  void OnPickerPointSelected(const QwtDoublePoint & p);
+
+signals:
+  void plotPointSelected(const QPointF p);
+
+protected:
+
+private:
+
+  void _resetXAxisPoints();
+  
+  double _startFrequency;
+  double _stopFrequency;
+  double _maxYAxis;
+  double _minYAxis;
+  
+  QwtPlotCurve* _fft_plot_curve;
+  QwtPlotCurve* _min_fft_plot_curve;
+  QwtPlotCurve* _max_fft_plot_curve;
+
+  QwtPlotMarker* _lower_intensity_marker;
+  QwtPlotMarker* _upper_intensity_marker;
+
+  QwtPlotPanner* _panner;
+  QwtPlotZoomer* _zoomer;
+
+  QwtPlotMarker *_markerPeakAmplitude;
+  QwtPlotMarker *_markerNoiseFloorAmplitude;
+  QwtPlotMarker *_markerCF;
+
+  QwtDblClickPlotPicker *_picker;
+  QwtPlotMagnifier *_magnifier;
+  
+  double* _dataPoints;
+  double* _xAxisPoints;
+  int     _xAxisMultiplier;
+
+  double* _minFFTPoints;
+  double* _maxFFTPoints;
+  int64_t _numPoints;
+
+  double _peakFrequency;
+  double _peakAmplitude;
+
+  double _noiseFloorAmplitude;
+
+  timespec _lastReplot;
+
+  bool _useCenterFrequencyFlag;
+};
+
+#endif /* FREQUENCY_DISPLAY_PLOT_HPP */