z(km) σ 75.984 1.366 75.979 0 72.601 0 72.607 1.639 71.481 1.639 71.475 0 63.592 0 63.65 15.301 58.395 15.301 58.271 32.24 53.767 32.24 53.682 9.563 50.867 9.563 50.644 0.273