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diff --git a/tools/gr-usrptest/lib/measurement_sink_f_impl.h b/tools/gr-usrptest/lib/measurement_sink_f_impl.h
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+++ b/tools/gr-usrptest/lib/measurement_sink_f_impl.h
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+/* -*- c++ -*- */
+/* 
+ * Copyright 2016 Ettus Research LLC.
+ * 
+ * This 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.
+ * 
+ * This software 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 this software; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef INCLUDED_USRPTEST_MEASUREMENT_SINK_F_IMPL_H
+#define INCLUDED_USRPTEST_MEASUREMENT_SINK_F_IMPL_H
+
+#include <usrptest/measurement_sink_f.h>
+
+namespace gr {
+  namespace usrptest {
+
+    class measurement_sink_f_impl : public measurement_sink_f
+    {
+     private:
+       std::vector< float > d_avg;
+       std::vector< float > d_stddev;
+       bool d_run;
+       int d_runs;
+       int d_nsamples;
+       int d_curr_sample;
+       int d_curr_run;
+       float d_curr_avg;
+       float d_curr_M2;
+       void inc_both(const float new_val);
+
+
+     public:
+      measurement_sink_f_impl(int num_samples, int runs);
+      ~measurement_sink_f_impl();
+      std::vector<float> get_avg() const;
+      std::vector<float> get_stddev() const;
+      int get_run() const;
+      void start_run();
+
+      // Where all the action really happens
+      int work(int noutput_items,
+         gr_vector_const_void_star &input_items,
+         gr_vector_void_star &output_items);
+    };
+
+  } // namespace usrptest
+} // namespace gr
+
+#endif /* INCLUDED_USRPTEST_MEASUREMENT_SINK_F_IMPL_H */
+