renderer2);
plot2.setBackgroundPaint(Color.lightGray);
plot2.setDomainGridlinePaint(Color.white);
plot2.setRangeGridlinePaint(Color.white);
CombinedXYPlot cplot = new CombinedXYPlot(domainAxis, rangeAxis);
cplot.add(plot1, 3);
cplot.add(plot2, 2);
cplot.setGap(8.0);
cplot.setDomainGridlinePaint(Color.white);
cplot.setDomainGridlinesVisible(true);
// return a new chart containing the overlaid plot...
JFreeChart chart = new JFreeChart("CombinedXYPlotDemo1",
JFreeChart.DEFAULT_TITLE_FONT, cplot, false);
chart.setBackgroundPaint(Color.white);