@Test
public void testMagnitudeGrid() {

    final Grid grid = lut1.getMagnitudeGrid5();
    assertNotNull(grid);
    assertEquals(0.9132683f, (float) grid.getSampleDouble(0, 4), 0.0f);
    assertEquals(0.7707501f, (float) grid.getSampleDouble(39, 3), 0.0f);
}