z(km) σ 91.622 1.466 91.622 0.072 89.761 0.89 86.037 0.885 78.59 0.549 76.729 0.628 76.729 0.383 74.867 0.38 74.867 0.053 66.862 0.043 66.862 0.371 64.814 0.369 64.814 0.041 60.904 0.036 58.856 0.034 58.856 0.198 56.809 0.195 56.809 2.49 55.133 2.488 54.947 5.767 53.644 5.765 53.457 8.306 51.596 8.304 51.596 10.517 50.293 10.516 50.293 0.024