plot1.setOrientation(PlotOrientation.HORIZONTAL);
        assertFalse(plot1.equals(plot2));
        plot2.setOrientation(PlotOrientation.HORIZONTAL);
        assertTrue(plot1.equals(plot2));
        
        // axisOffset...
        plot1.setAxisOffset(new RectangleInsets(0.05, 0.05, 0.05, 0.05));
        assertFalse(plot1.equals(plot2));
        plot2.setAxisOffset(new RectangleInsets(0.05, 0.05, 0.05, 0.05));
        assertTrue(plot1.equals(plot2));

        // domainAxis...
        plot1.setDomainAxis(new NumberAxis("Domain Axis"));
        assertFalse(plot1.equals(plot2));
        plot2.setDomainAxis(new NumberAxis("Domain Axis"));
        assertTrue(plot1.equals(plot2));