I am trying to get a JFreeChart ChartPanel to remove unwanted extra space between the edge of the panel and the graph itself.

To best illustrate, here's a SSCCE (with JFreeChart installed):

public static void main(String[] args) {
    JPanel panel = new JPanel(new GridBagLayout());
    GridBagConstraints gbc = new GridBagConstraints();

    gbc.fill = GridBagConstraints.BOTH;
    gbc.gridwidth = 1;
    gbc.gridheight = 1;
    gbc.weightx = 1;
    gbc.weighty = 1;
    gbc.gridy = 1;

    gbc.gridx = 1;
    panel.add(createChart("Sales", Chart_Type.DOLLARS, 100000, 115000), gbc);
    gbc.gridx = 2;
    panel.add(createChart("Quotes", Chart_Type.DOLLARS, 250000, 240000), gbc);
    gbc.gridx = 3;
    panel.add(createChart("Profits", Chart_Type.PERCENTAGE, 40.00, 38.00), gbc);

    JFrame frame = new JFrame();
    frame.add(panel);
    frame.setSize(800, 300);
    frame.setLocationRelativeTo(null);
    frame.setVisible(true);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}

private static ChartPanel createChart(String title, Chart_Type type, double goal, double actual) {
    double maxValue = goal * 2;
    double yellowToGreenNum = goal;
    double redToYellowNum = goal * .75;
    DefaultValueDataset dataset = new DefaultValueDataset(actual);

    JFreeChart jfreechart = createChart(dataset, Math.max(actual, maxValue), redToYellowNum, yellowToGreenNum, title, type);
    ChartPanel chartPanel = new ChartPanel(jfreechart);
    chartPanel.setBorder(new LineBorder(Color.red));
    return chartPanel;
}

private static JFreeChart createChart(ValueDataset valuedataset, Number maxValue, Number redToYellowNum, Number yellowToGreenNum, String title, Chart_Type type) {
    MeterPlot meterplot = new MeterPlot(valuedataset);
    meterplot.setRange(new Range(0.0D, maxValue.doubleValue()));
    meterplot.addInterval(new MeterInterval(" Goal Not Met ",
            new Range(0.0D, redToYellowNum.doubleValue()), Color.lightGray, new BasicStroke(2.0F),
            new Color(255, 0, 0, 128)));
    meterplot.addInterval(new MeterInterval(" Goal Almost Met ",
            new Range(redToYellowNum.doubleValue(), yellowToGreenNum.doubleValue()), Color.lightGray, new BasicStroke(2.0F),
            new Color(255, 255, 0, 64)));
    meterplot.addInterval(new MeterInterval(" Goal Met ",
            new Range(yellowToGreenNum.doubleValue(), maxValue.doubleValue()), Color.lightGray, new BasicStroke(2.0F),
            new Color(0, 255, 0, 64)));
    meterplot.setNeedlePaint(Color.darkGray);
    meterplot.setDialBackgroundPaint(Color.white);
    meterplot.setDialOutlinePaint(Color.gray);
    meterplot.setDialShape(DialShape.CHORD);
    meterplot.setMeterAngle(260);
    meterplot.setTickLabelsVisible(false);

    meterplot.setTickSize(maxValue.doubleValue() / 20);
    meterplot.setTickPaint(Color.lightGray);

    meterplot.setValuePaint(Color.black);
    meterplot.setValueFont(new Font("Dialog", Font.BOLD, 0));
    meterplot.setUnits("");
    if(type == Chart_Type.DOLLARS)
        meterplot.setTickLabelFormat(NumberFormat.getCurrencyInstance());
    else if(type == Chart_Type.PERCENTAGE)
        meterplot.setTickLabelFormat(NumberFormat.getPercentInstance());
    JFreeChart jfreechart = new JFreeChart(title,
            JFreeChart.DEFAULT_TITLE_FONT, meterplot, false);
    return jfreechart;
}

enum Chart_Type {
    DOLLARS,
    PERCENTAGE
}

If you resize the frame, you can see that you cannot make the edge of the graph go to the edge of the panel (the panels are outlined in red). Especially on the bottom - there is always a gap between the bottom the graph and the bottom of the panel.

Is there a way to make the graph fill the entire area? Is there a way to at least guarantee that it is touching one edge of the panel (i.e., it is touching the top and bottom or the left and right) ??