// ---
    transmission_graph_frame.setIconImage( the_icon.getImage() );
    transmission_graph_frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
    transmission_graph_frame.setSize(640, 480);
    transmission_graph_frame.setMinimumSize( new Dimension(400, 400) );
    jfreechart = ChartFactory.createXYLineChart("Transmission Rate", "Time (ms)", "Packets per Second", transmission_xyseriescollection, PlotOrientation.VERTICAL, true, true, false);
    ( (XYPlot) jfreechart.getPlot() ).setRenderer( new XYLineAndShapeRenderer() ); // this should cause symbols to be plotted at each data point
    chartpanel = new ChartPanel(jfreechart);
    transmission_graph_frame.add(chartpanel);

    tempB = new Hashtable<MotePartner, XYSeries>();
    for (MotePartner mote : the_mote_partners) {
      final XYSeries temp = new XYSeries( /*mote.identify()*/ mote.legend() );
      tempB.put(mote, temp);
      transmission_xyseriescollection.addSeries(temp);
    } // end for
    the_MP_to_transmission_series_HT = tempB; // race-free, with any luck ;-)

    show_transmission_graph_button = new JButton("Show Transm. Graph");
    show_transmission_graph_button.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent AE) {
        transmission_graph_frame.setVisible(true);
        transmission_graph_frame.setState(JFrame.NORMAL); // de-iconify if possible - this is a good reason to leave the "show" button always enabled
      }
    });

// ---


public void transmission_interval(MotePartner source, long time, int status, boolean asleep, boolean stopped, long level, long mote_src) {
    try {
				if (null != the_MP_to_transmission_series_HT) {
					if(transmission_xyseriescollection.getSeriesCount() == 4) {
						//int src = (int)mote_src - 1;
						if(transmission_xyseriescollection.getSeries(src).getItemCount() >= 150) {
							transmission_xyseriescollection.getSeries(src).remove(0);//delete(0, 1);
						}
					}

					the_MP_to_transmission_series_HT.get(source).add(time, level);
				}
    } catch (ArrayIndexOutOfBoundsException exp) {
    } catch (Exception E) {
      //System.err.println("source.identify()" + source.identify());
      //System.err.println("Exception: "+E);
    }
  }// end of "transmission_interval"