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diff --git a/gr-qtgui/include/qtgui/const_sink_c.h b/gr-qtgui/include/qtgui/const_sink_c.h
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+++ b/gr-qtgui/include/qtgui/const_sink_c.h
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+/* -*- c++ -*- */
+/*
+ * Copyright 2012 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 INCLUDED_QTGUI_CONST_SINK_C_H
+#define INCLUDED_QTGUI_CONST_SINK_C_H
+
+#include <Python.h>
+#include <qtgui/api.h>
+#include <gr_sync_block.h>
+#include <qapplication.h>
+#include <qwt_symbol.h>
+
+namespace gr {
+  namespace qtgui {
+    
+    /*!
+     * \brief A graphical sink to display the IQ constellation of multiple signals.
+     * \ingroup qtgui_blk
+     *
+     * This is a QT-based graphical sink the takes set of a complex
+     * streams and plots them on an IQ constellation plot.
+     */
+    class QTGUI_API const_sink_c : virtual public gr_sync_block
+    {
+    public:
+      // gr::qtgui::const_sink_c::sptr
+      typedef boost::shared_ptr<const_sink_c> sptr;
+
+      /*!
+       * \brief Build a complex PSD sink.
+       *
+       * \param size number of points to plot at once
+       * \param name title for the plot
+       * \param nconnections number of signals connected to sink
+       * \param parent a QWidget parent object, if any
+       */
+      static sptr make(int size,
+		       const std::string &name,
+		       int nconnections,
+		       QWidget *parent=NULL);
+
+      virtual void exec_() = 0;
+      virtual PyObject* pyqwidget() = 0;
+
+      virtual void set_y_axis(double min, double max) = 0;
+      virtual void set_x_axis(double min, double max) = 0;
+
+      virtual void set_update_time(double t) = 0;
+      virtual void set_title(const std::string &title) = 0;
+      virtual void set_line_label(int which, const std::string &label) = 0;
+      virtual void set_line_color(int which, const std::string &color) = 0;
+      virtual void set_line_width(int which, int width) = 0;
+      virtual void set_line_style(int which, Qt::PenStyle style) = 0;
+      virtual void set_line_marker(int which, QwtSymbol::Style marker) = 0;
+      virtual void set_nsamps(const int newsize) = 0;
+
+      virtual void set_size(int width, int height) = 0;
+
+      virtual int nsamps() const = 0;
+      virtual void reset() = 0;
+
+      QApplication *d_qApplication;
+    };
+
+  } /* namespace qtgui */
+} /* namespace gr */
+
+#endif /* INCLUDED_QTGUI_CONST_SINK_C_H */