plot1.setLabelLinkPaint(new GradientPaint(1.0f, 2.0f, Color.magenta, 
                3.0f, 4.0f, Color.white));
        assertFalse(plot1.equals(plot2));
        plot2.setLabelLinkPaint(new GradientPaint(1.0f, 2.0f, Color.magenta, 
                3.0f, 4.0f, Color.white));
        assertTrue(plot1.equals(plot2));