plot1.setBaseSectionPaint(new GradientPaint(1.0f, 2.0f, Color.black, 
                3.0f, 4.0f, Color.white));
        assertFalse(plot1.equals(plot2));
        plot2.setBaseSectionPaint(new GradientPaint(1.0f, 2.0f, Color.black, 
                3.0f, 4.0f, Color.white));
        assertTrue(plot1.equals(plot2));
        
        // sectionOutlinesVisible
        plot1.setSectionOutlinesVisible(false);
        assertFalse(plot1.equals(plot2));
        plot2.setSectionOutlinesVisible(false);
        assertTrue(plot1.equals(plot2));