@Test
public void testThickness() {

    double latitude = 1.25;
    double altitude = 20.90;
    double seaLevelPressure = 0.8;
    double sigma = 0.5;
    double rayThickness = algo.getRayleighOpticalThickness(sigma, seaLevelPressure, altitude, latitude);
    assertEquals(8.496979944265044E21, rayThickness, 1e-8);
}