a1.setTickLabelInsets(new RectangleInsets(10.0, 10.0, 10.0, 10.0));
        assertFalse(a1.equals(a2));
        a2.setTickLabelInsets(new RectangleInsets(10.0, 10.0, 10.0, 10.0));
        assertTrue(a1.equals(a2));

        // tick marks visible flag...
        a1.setTickMarksVisible(true);
        assertFalse(a1.equals(a2));