Differential atmospheric refraction at the NOT as a function of wavelength (horizontal, in Angstrom) and airmass (vertical), for T = 0 deg, R.H. = 80 %, Pressure = 770 mbar. The values are in arcseconds with respect to a wavelength of 5000 Angstrom 3000 3500 4000 4500 5000 5500 6000 6500 7000 7500 8000 8500 9000 9500 10000 Sec Z 1.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 1.05 0.67 0.38 0.20 0.08 0.00 -0.06 -0.11 -0.14 -0.17 -0.19 -0.21 -0.22 -0.24 -0.25 -0.25 1.10 0.96 0.54 0.29 0.12 0.00 -0.09 -0.15 -0.20 -0.24 -0.27 -0.30 -0.32 -0.34 -0.35 -0.36 1.15 1.18 0.67 0.36 0.15 0.00 -0.11 -0.19 -0.25 -0.30 -0.34 -0.37 -0.40 -0.42 -0.44 -0.45 1.20 1.38 0.79 0.42 0.17 0.00 -0.12 -0.22 -0.29 -0.35 -0.39 -0.43 -0.46 -0.49 -0.51 -0.53 1.25 1.56 0.89 0.47 0.19 0.00 -0.14 -0.25 -0.33 -0.39 -0.45 -0.49 -0.52 -0.55 -0.58 -0.60 1.30 1.73 0.98 0.52 0.21 0.00 -0.16 -0.27 -0.36 -0.44 -0.49 -0.54 -0.58 -0.61 -0.64 -0.66 1.35 1.89 1.07 0.57 0.23 0.00 -0.17 -0.30 -0.40 -0.48 -0.54 -0.59 -0.63 -0.67 -0.70 -0.72 1.40 2.04 1.16 0.61 0.25 0.00 -0.18 -0.32 -0.43 -0.51 -0.58 -0.64 -0.68 -0.72 -0.75 -0.78 1.45 2.19 1.24 0.66 0.27 0.00 -0.20 -0.35 -0.46 -0.55 -0.62 -0.68 -0.73 -0.77 -0.81 -0.84 1.50 2.33 1.32 0.70 0.29 0.00 -0.21 -0.37 -0.49 -0.59 -0.66 -0.73 -0.78 -0.82 -0.86 -0.89 1.55 2.47 1.40 0.74 0.31 0.00 -0.22 -0.39 -0.52 -0.62 -0.70 -0.77 -0.82 -0.87 -0.91 -0.94 1.60 2.61 1.48 0.78 0.32 0.00 -0.23 -0.41 -0.55 -0.66 -0.74 -0.81 -0.87 -0.92 -0.96 -0.99 1.65 2.74 1.55 0.82 0.34 0.00 -0.25 -0.43 -0.58 -0.69 -0.78 -0.85 -0.91 -0.96 -1.01 -1.04 1.70 2.87 1.63 0.86 0.35 0.00 -0.26 -0.45 -0.60 -0.72 -0.82 -0.89 -0.96 -1.01 -1.06 -1.09 1.75 3.00 1.70 0.90 0.37 0.00 -0.27 -0.47 -0.63 -0.75 -0.85 -0.93 -1.00 -1.06 -1.10 -1.14 1.80 3.12 1.77 0.94 0.39 0.00 -0.28 -0.49 -0.66 -0.79 -0.89 -0.97 -1.04 -1.10 -1.15 -1.19 1.85 3.25 1.84 0.98 0.40 0.00 -0.29 -0.51 -0.68 -0.82 -0.92 -1.01 -1.08 -1.14 -1.19 -1.24 1.90 3.37 1.91 1.01 0.42 0.00 -0.30 -0.53 -0.71 -0.85 -0.96 -1.05 -1.12 -1.19 -1.24 -1.29 1.95 3.49 1.98 1.05 0.43 0.00 -0.31 -0.55 -0.73 -0.88 -0.99 -1.09 -1.17 -1.23 -1.29 -1.33 2.00 3.61 2.05 1.09 0.45 0.00 -0.33 -0.57 -0.76 -0.91 -1.03 -1.13 -1.21 -1.27 -1.33 -1.38 2.05 3.73 2.12 1.12 0.46 0.00 -0.34 -0.59 -0.78 -0.94 -1.06 -1.16 -1.25 -1.32 -1.37 -1.42 2.10 3.85 2.19 1.16 0.48 0.00 -0.35 -0.61 -0.81 -0.97 -1.10 -1.20 -1.29 -1.36 -1.42 -1.47 2.15 3.97 2.25 1.19 0.49 0.00 -0.36 -0.63 -0.83 -1.00 -1.13 -1.24 -1.33 -1.40 -1.46 -1.51 2.20 4.09 2.32 1.23 0.51 0.00 -0.37 -0.65 -0.86 -1.03 -1.16 -1.27 -1.36 -1.44 -1.50 -1.56 2.25 4.21 2.39 1.26 0.52 0.00 -0.38 -0.66 -0.88 -1.06 -1.20 -1.31 -1.40 -1.48 -1.55 -1.60 2.30 4.32 2.45 1.30 0.53 0.00 -0.39 -0.68 -0.91 -1.09 -1.23 -1.35 -1.44 -1.52 -1.59 -1.65 2.35 4.44 2.52 1.33 0.55 0.00 -0.40 -0.70 -0.93 -1.12 -1.26 -1.38 -1.48 -1.56 -1.63 -1.69 2.40 4.55 2.58 1.37 0.56 0.00 -0.41 -0.72 -0.96 -1.14 -1.30 -1.42 -1.52 -1.60 -1.68 -1.74 2.45 4.67 2.65 1.40 0.58 0.00 -0.42 -0.74 -0.98 -1.17 -1.33 -1.45 -1.56 -1.64 -1.72 -1.78 2.50 4.78 2.71 1.44 0.59 0.00 -0.43 -0.75 -1.00 -1.20 -1.36 -1.49 -1.60 -1.68 -1.76 -1.82 2.55 4.89 2.78 1.47 0.61 0.00 -0.44 -0.77 -1.03 -1.23 -1.39 -1.52 -1.63 -1.72 -1.80 -1.87 2.60 5.01 2.84 1.51 0.62 0.00 -0.45 -0.79 -1.05 -1.26 -1.42 -1.56 -1.67 -1.76 -1.84 -1.91 2.65 5.12 2.90 1.54 0.63 0.00 -0.46 -0.81 -1.08 -1.29 -1.46 -1.59 -1.71 -1.80 -1.88 -1.95 2.70 5.23 2.97 1.57 0.65 0.00 -0.47 -0.83 -1.10 -1.32 -1.49 -1.63 -1.75 -1.84 -1.93 -2.00 2.75 5.35 3.03 1.61 0.66 0.00 -0.48 -0.84 -1.12 -1.34 -1.52 -1.66 -1.78 -1.88 -1.97 -2.04 2.80 5.46 3.10 1.64 0.68 0.00 -0.49 -0.86 -1.15 -1.37 -1.55 -1.70 -1.82 -1.92 -2.01 -2.08 2.85 5.57 3.16 1.67 0.69 0.00 -0.50 -0.88 -1.17 -1.40 -1.58 -1.73 -1.86 -1.96 -2.05 -2.12 2.90 5.68 3.22 1.71 0.70 0.00 -0.51 -0.90 -1.19 -1.43 -1.62 -1.77 -1.90 -2.00 -2.09 -2.17 2.95 5.79 3.28 1.74 0.72 0.00 -0.52 -0.91 -1.22 -1.46 -1.65 -1.80 -1.93 -2.04 -2.13 -2.21 3.00 5.90 3.35 1.77 0.73 0.00 -0.53 -0.93 -1.24 -1.48 -1.68 -1.84 -1.97 -2.08 -2.17 -2.25 3.05 6.01 3.41 1.81 0.74 0.00 -0.54 -0.95 -1.26 -1.51 -1.71 -1.87 -2.01 -2.12 -2.21 -2.29 3.10 6.12 3.47 1.84 0.76 0.00 -0.55 -0.97 -1.29 -1.54 -1.74 -1.91 -2.04 -2.16 -2.25 -2.33 3.15 6.23 3.54 1.87 0.77 0.00 -0.56 -0.98 -1.31 -1.57 -1.77 -1.94 -2.08 -2.20 -2.29 -2.38 3.20 6.34 3.60 1.91 0.78 0.00 -0.57 -1.00 -1.33 -1.59 -1.80 -1.98 -2.12 -2.23 -2.33 -2.42 3.25 6.45 3.66 1.94 0.80 0.00 -0.58 -1.02 -1.36 -1.62 -1.84 -2.01 -2.15 -2.27 -2.37 -2.46 3.30 6.56 3.72 1.97 0.81 0.00 -0.59 -1.04 -1.38 -1.65 -1.87 -2.04 -2.19 -2.31 -2.41 -2.50 3.35 6.67 3.78 2.01 0.83 0.00 -0.60 -1.05 -1.40 -1.68 -1.90 -2.08 -2.23 -2.35 -2.45 -2.54 3.40 6.78 3.85 2.04 0.84 0.00 -0.61 -1.07 -1.43 -1.70 -1.93 -2.11 -2.26 -2.39 -2.49 -2.59 3.45 6.89 3.91 2.07 0.85 0.00 -0.62 -1.09 -1.45 -1.73 -1.96 -2.15 -2.30 -2.43 -2.54 -2.63 3.50 7.00 3.97 2.10 0.87 0.00 -0.63 -1.11 -1.47 -1.76 -1.99 -2.18 -2.34 -2.47 -2.58 -2.67 3.55 7.11 4.03 2.14 0.88 0.00 -0.64 -1.12 -1.49 -1.79 -2.02 -2.21 -2.37 -2.50 -2.62 -2.71 3.60 7.22 4.09 2.17 0.89 0.00 -0.65 -1.14 -1.52 -1.81 -2.05 -2.25 -2.41 -2.54 -2.66 -2.75 3.65 7.32 4.15 2.20 0.91 0.00 -0.66 -1.16 -1.54 -1.84 -2.08 -2.28 -2.44 -2.58 -2.70 -2.79 3.70 7.43 4.22 2.23 0.92 0.00 -0.67 -1.17 -1.56 -1.87 -2.11 -2.31 -2.48 -2.62 -2.73 -2.83 3.75 7.54 4.28 2.27 0.93 0.00 -0.68 -1.19 -1.59 -1.90 -2.15 -2.35 -2.52 -2.66 -2.77 -2.88 3.80 7.65 4.34 2.30 0.95 0.00 -0.69 -1.21 -1.61 -1.92 -2.18 -2.38 -2.55 -2.69 -2.81 -2.92 3.85 7.76 4.40 2.33 0.96 0.00 -0.70 -1.23 -1.63 -1.95 -2.21 -2.42 -2.59 -2.73 -2.85 -2.96 3.90 7.87 4.46 2.36 0.97 0.00 -0.71 -1.24 -1.65 -1.98 -2.24 -2.45 -2.62 -2.77 -2.89 -3.00 3.95 7.97 4.52 2.40 0.99 0.00 -0.72 -1.26 -1.68 -2.00 -2.27 -2.48 -2.66 -2.81 -2.93 -3.04 4.00 8.08 4.58 2.43 1.00 0.00 -0.73 -1.28 -1.70 -2.03 -2.30 -2.52 -2.70 -2.85 -2.97 -3.08 4.05 8.19 4.64 2.46 1.01 0.00 -0.74 -1.29 -1.72 -2.06 -2.33 -2.55 -2.73 -2.88 -3.01 -3.12 4.10 8.30 4.71 2.49 1.03 0.00 -0.75 -1.31 -1.74 -2.09 -2.36 -2.58 -2.77 -2.92 -3.05 -3.16 4.15 8.40 4.77 2.53 1.04 0.00 -0.76 -1.33 -1.77 -2.11 -2.39 -2.62 -2.80 -2.96 -3.09 -3.20 4.20 8.51 4.83 2.56 1.05 0.00 -0.77 -1.34 -1.79 -2.14 -2.42 -2.65 -2.84 -3.00 -3.13 -3.25 4.25 8.62 4.89 2.59 1.07 0.00 -0.78 -1.36 -1.81 -2.17 -2.45 -2.68 -2.88 -3.04 -3.17 -3.29 4.30 8.73 4.95 2.62 1.08 0.00 -0.79 -1.38 -1.83 -2.19 -2.48 -2.72 -2.91 -3.07 -3.21 -3.33 4.35 8.83 5.01 2.66 1.09 0.00 -0.80 -1.39 -1.86 -2.22 -2.51 -2.75 -2.95 -3.11 -3.25 -3.37 4.40 8.94 5.07 2.69 1.11 0.00 -0.81 -1.41 -1.88 -2.25 -2.54 -2.78 -2.98 -3.15 -3.29 -3.41 4.45 9.05 5.13 2.72 1.12 0.00 -0.82 -1.43 -1.90 -2.27 -2.57 -2.82 -3.02 -3.19 -3.33 -3.45 4.50 9.15 5.19 2.75 1.13 0.00 -0.83 -1.45 -1.92 -2.30 -2.60 -2.85 -3.05 -3.22 -3.37 -3.49 4.55 9.26 5.25 2.78 1.15 0.00 -0.83 -1.46 -1.95 -2.33 -2.63 -2.88 -3.09 -3.26 -3.41 -3.53 4.60 9.37 5.31 2.82 1.16 0.00 -0.84 -1.48 -1.97 -2.36 -2.67 -2.92 -3.13 -3.30 -3.45 -3.57 4.65 9.48 5.37 2.85 1.17 0.00 -0.85 -1.50 -1.99 -2.38 -2.70 -2.95 -3.16 -3.34 -3.49 -3.61 4.70 9.58 5.44 2.88 1.19 0.00 -0.86 -1.51 -2.01 -2.41 -2.73 -2.98 -3.20 -3.38 -3.53 -3.65 4.75 9.69 5.50 2.91 1.20 0.00 -0.87 -1.53 -2.04 -2.44 -2.76 -3.02 -3.23 -3.41 -3.57 -3.69 4.80 9.80 5.56 2.94 1.21 0.00 -0.88 -1.55 -2.06 -2.46 -2.79 -3.05 -3.27 -3.45 -3.60 -3.74 4.85 9.90 5.62 2.98 1.23 0.00 -0.89 -1.56 -2.08 -2.49 -2.82 -3.08 -3.30 -3.49 -3.64 -3.78 4.90 10.01 5.68 3.01 1.24 0.00 -0.90 -1.58 -2.10 -2.52 -2.85 -3.12 -3.34 -3.53 -3.68 -3.82