Differential atmospheric refraction at the NOT as a function of wavelength (horizontal, in Angstrom) and airmass (vertical), for T = 10 deg, R.H. = 30 %, 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 0.64 0.37 0.19 0.08 0.00 -0.06 -0.10 -0.14 -0.16 -0.18 -0.20 -0.21 -0.23 -0.24 -0.25 1.10 0.92 0.52 0.28 0.11 0.00 -0.08 -0.15 -0.19 -0.23 -0.26 -0.29 -0.31 -0.32 -0.34 -0.35 1.15 1.14 0.65 0.34 0.14 0.00 -0.10 -0.18 -0.24 -0.29 -0.32 -0.36 -0.38 -0.40 -0.42 -0.44 1.20 1.33 0.76 0.40 0.17 0.00 -0.12 -0.21 -0.28 -0.34 -0.38 -0.42 -0.45 -0.47 -0.49 -0.51 1.25 1.51 0.86 0.45 0.19 0.00 -0.14 -0.24 -0.32 -0.38 -0.43 -0.47 -0.50 -0.53 -0.56 -0.58 1.30 1.67 0.95 0.50 0.21 0.00 -0.15 -0.26 -0.35 -0.42 -0.48 -0.52 -0.56 -0.59 -0.61 -0.64 1.35 1.82 1.03 0.55 0.23 0.00 -0.16 -0.29 -0.38 -0.46 -0.52 -0.57 -0.61 -0.64 -0.67 -0.70 1.40 1.97 1.12 0.59 0.24 0.00 -0.18 -0.31 -0.41 -0.50 -0.56 -0.61 -0.66 -0.69 -0.73 -0.75 1.45 2.11 1.20 0.64 0.26 0.00 -0.19 -0.33 -0.44 -0.53 -0.60 -0.66 -0.70 -0.74 -0.78 -0.81 1.50 2.25 1.28 0.68 0.28 0.00 -0.20 -0.36 -0.47 -0.57 -0.64 -0.70 -0.75 -0.79 -0.83 -0.86 1.55 2.38 1.35 0.72 0.29 0.00 -0.21 -0.38 -0.50 -0.60 -0.68 -0.74 -0.79 -0.84 -0.88 -0.91 1.60 2.51 1.43 0.76 0.31 0.00 -0.23 -0.40 -0.53 -0.63 -0.71 -0.78 -0.84 -0.89 -0.92 -0.96 1.65 2.64 1.50 0.79 0.33 0.00 -0.24 -0.42 -0.56 -0.66 -0.75 -0.82 -0.88 -0.93 -0.97 -1.01 1.70 2.77 1.57 0.83 0.34 0.00 -0.25 -0.44 -0.58 -0.70 -0.79 -0.86 -0.92 -0.97 -1.02 -1.05 1.75 2.89 1.64 0.87 0.36 0.00 -0.26 -0.46 -0.61 -0.73 -0.82 -0.90 -0.96 -1.02 -1.06 -1.10 1.80 3.01 1.71 0.91 0.37 0.00 -0.27 -0.48 -0.63 -0.76 -0.86 -0.94 -1.00 -1.06 -1.11 -1.15 1.85 3.13 1.78 0.94 0.39 0.00 -0.28 -0.49 -0.66 -0.79 -0.89 -0.98 -1.04 -1.10 -1.15 -1.19 1.90 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 -1.20 -1.24 1.95 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 -1.28 2.00 3.48 1.98 1.05 0.43 0.00 -0.31 -0.55 -0.73 -0.88 -0.99 -1.09 -1.16 -1.23 -1.28 -1.33 2.05 3.60 2.04 1.08 0.45 0.00 -0.32 -0.57 -0.76 -0.91 -1.02 -1.12 -1.20 -1.27 -1.32 -1.37 2.10 3.71 2.11 1.12 0.46 0.00 -0.33 -0.59 -0.78 -0.93 -1.06 -1.16 -1.24 -1.31 -1.37 -1.42 2.15 3.83 2.17 1.15 0.47 0.00 -0.35 -0.60 -0.80 -0.96 -1.09 -1.19 -1.28 -1.35 -1.41 -1.46 2.20 3.94 2.24 1.19 0.49 0.00 -0.36 -0.62 -0.83 -0.99 -1.12 -1.23 -1.32 -1.39 -1.45 -1.50 2.25 4.05 2.30 1.22 0.50 0.00 -0.37 -0.64 -0.85 -1.02 -1.15 -1.26 -1.35 -1.43 -1.49 -1.55 2.30 4.17 2.36 1.25 0.52 0.00 -0.38 -0.66 -0.88 -1.05 -1.19 -1.30 -1.39 -1.47 -1.53 -1.59 2.35 4.28 2.43 1.29 0.53 0.00 -0.39 -0.68 -0.90 -1.08 -1.22 -1.33 -1.43 -1.51 -1.57 -1.63 2.40 4.39 2.49 1.32 0.54 0.00 -0.40 -0.69 -0.92 -1.10 -1.25 -1.37 -1.46 -1.55 -1.61 -1.67 2.45 4.50 2.55 1.35 0.56 0.00 -0.41 -0.71 -0.95 -1.13 -1.28 -1.40 -1.50 -1.58 -1.66 -1.72 2.50 4.61 2.61 1.39 0.57 0.00 -0.42 -0.73 -0.97 -1.16 -1.31 -1.44 -1.54 -1.62 -1.70 -1.76 2.55 4.72 2.68 1.42 0.58 0.00 -0.43 -0.75 -0.99 -1.19 -1.34 -1.47 -1.57 -1.66 -1.74 -1.80 2.60 4.83 2.74 1.45 0.60 0.00 -0.44 -0.76 -1.01 -1.21 -1.37 -1.50 -1.61 -1.70 -1.78 -1.84 2.65 4.94 2.80 1.48 0.61 0.00 -0.45 -0.78 -1.04 -1.24 -1.40 -1.54 -1.65 -1.74 -1.82 -1.88 2.70 5.04 2.86 1.52 0.62 0.00 -0.45 -0.80 -1.06 -1.27 -1.44 -1.57 -1.68 -1.78 -1.86 -1.92 2.75 5.15 2.92 1.55 0.64 0.00 -0.46 -0.81 -1.08 -1.30 -1.47 -1.60 -1.72 -1.82 -1.90 -1.97 2.80 5.26 2.98 1.58 0.65 0.00 -0.47 -0.83 -1.11 -1.32 -1.50 -1.64 -1.76 -1.85 -1.94 -2.01 2.85 5.37 3.05 1.61 0.66 0.00 -0.48 -0.85 -1.13 -1.35 -1.53 -1.67 -1.79 -1.89 -1.98 -2.05 2.90 5.48 3.11 1.65 0.68 0.00 -0.49 -0.86 -1.15 -1.38 -1.56 -1.71 -1.83 -1.93 -2.01 -2.09 2.95 5.58 3.17 1.68 0.69 0.00 -0.50 -0.88 -1.17 -1.40 -1.59 -1.74 -1.86 -1.97 -2.05 -2.13 3.00 5.69 3.23 1.71 0.70 0.00 -0.51 -0.90 -1.20 -1.43 -1.62 -1.77 -1.90 -2.00 -2.09 -2.17 3.05 5.80 3.29 1.74 0.72 0.00 -0.52 -0.92 -1.22 -1.46 -1.65 -1.81 -1.93 -2.04 -2.13 -2.21 3.10 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 3.15 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 3.20 6.11 3.47 1.84 0.76 0.00 -0.55 -0.97 -1.29 -1.54 -1.74 -1.90 -2.04 -2.15 -2.25 -2.33 3.25 6.22 3.53 1.87 0.77 0.00 -0.56 -0.98 -1.31 -1.56 -1.77 -1.94 -2.08 -2.19 -2.29 -2.37 3.30 6.33 3.59 1.90 0.78 0.00 -0.57 -1.00 -1.33 -1.59 -1.80 -1.97 -2.11 -2.23 -2.33 -2.41 3.35 6.43 3.65 1.93 0.80 0.00 -0.58 -1.02 -1.35 -1.62 -1.83 -2.00 -2.15 -2.27 -2.37 -2.45 3.40 6.54 3.71 1.97 0.81 0.00 -0.59 -1.03 -1.37 -1.64 -1.86 -2.04 -2.18 -2.30 -2.41 -2.49 3.45 6.64 3.77 2.00 0.82 0.00 -0.60 -1.05 -1.40 -1.67 -1.89 -2.07 -2.22 -2.34 -2.44 -2.53 3.50 6.75 3.83 2.03 0.84 0.00 -0.61 -1.07 -1.42 -1.70 -1.92 -2.10 -2.25 -2.38 -2.48 -2.57 3.55 6.85 3.89 2.06 0.85 0.00 -0.62 -1.08 -1.44 -1.72 -1.95 -2.13 -2.29 -2.41 -2.52 -2.61 3.60 6.96 3.95 2.09 0.86 0.00 -0.63 -1.10 -1.46 -1.75 -1.98 -2.17 -2.32 -2.45 -2.56 -2.65 3.65 7.06 4.01 2.12 0.87 0.00 -0.64 -1.12 -1.48 -1.78 -2.01 -2.20 -2.36 -2.49 -2.60 -2.69 3.70 7.17 4.06 2.15 0.89 0.00 -0.65 -1.13 -1.51 -1.80 -2.04 -2.23 -2.39 -2.52 -2.64 -2.73 3.75 7.27 4.12 2.19 0.90 0.00 -0.66 -1.15 -1.53 -1.83 -2.07 -2.26 -2.43 -2.56 -2.68 -2.77 3.80 7.37 4.18 2.22 0.91 0.00 -0.66 -1.16 -1.55 -1.85 -2.10 -2.30 -2.46 -2.60 -2.71 -2.81 3.85 7.48 4.24 2.25 0.93 0.00 -0.67 -1.18 -1.57 -1.88 -2.13 -2.33 -2.50 -2.63 -2.75 -2.85 3.90 7.58 4.30 2.28 0.94 0.00 -0.68 -1.20 -1.59 -1.91 -2.16 -2.36 -2.53 -2.67 -2.79 -2.89 3.95 7.69 4.36 2.31 0.95 0.00 -0.69 -1.21 -1.62 -1.93 -2.19 -2.39 -2.57 -2.71 -2.83 -2.93 4.00 7.79 4.42 2.34 0.96 0.00 -0.70 -1.23 -1.64 -1.96 -2.22 -2.43 -2.60 -2.74 -2.87 -2.97 4.05 7.89 4.48 2.37 0.98 0.00 -0.71 -1.25 -1.66 -1.98 -2.25 -2.46 -2.63 -2.78 -2.91 -3.01 4.10 8.00 4.54 2.40 0.99 0.00 -0.72 -1.26 -1.68 -2.01 -2.28 -2.49 -2.67 -2.82 -2.94 -3.05 4.15 8.10 4.60 2.44 1.00 0.00 -0.73 -1.28 -1.70 -2.04 -2.31 -2.52 -2.70 -2.85 -2.98 -3.09 4.20 8.21 4.65 2.47 1.02 0.00 -0.74 -1.30 -1.73 -2.06 -2.33 -2.56 -2.74 -2.89 -3.02 -3.13 4.25 8.31 4.71 2.50 1.03 0.00 -0.75 -1.31 -1.75 -2.09 -2.36 -2.59 -2.77 -2.93 -3.06 -3.17 4.30 8.41 4.77 2.53 1.04 0.00 -0.76 -1.33 -1.77 -2.12 -2.39 -2.62 -2.81 -2.96 -3.10 -3.21 4.35 8.52 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 4.40 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 4.45 8.72 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 4.50 8.83 5.01 2.65 1.09 0.00 -0.80 -1.39 -1.86 -2.22 -2.51 -2.75 -2.95 -3.11 -3.25 -3.37 4.55 8.93 5.06 2.68 1.11 0.00 -0.80 -1.41 -1.88 -2.25 -2.54 -2.78 -2.98 -3.15 -3.29 -3.41 4.60 9.03 5.12 2.72 1.12 0.00 -0.81 -1.43 -1.90 -2.27 -2.57 -2.81 -3.01 -3.18 -3.32 -3.44 4.65 9.13 5.18 2.75 1.13 0.00 -0.82 -1.44 -1.92 -2.30 -2.60 -2.85 -3.05 -3.22 -3.36 -3.48 4.70 9.24 5.24 2.78 1.14 0.00 -0.83 -1.46 -1.94 -2.32 -2.63 -2.88 -3.08 -3.25 -3.40 -3.52 4.75 9.34 5.30 2.81 1.16 0.00 -0.84 -1.48 -1.96 -2.35 -2.66 -2.91 -3.12 -3.29 -3.44 -3.56 4.80 9.44 5.36 2.84 1.17 0.00 -0.85 -1.49 -1.99 -2.37 -2.69 -2.94 -3.15 -3.33 -3.48 -3.60 4.85 9.55 5.42 2.87 1.18 0.00 -0.86 -1.51 -2.01 -2.40 -2.72 -2.97 -3.19 -3.36 -3.51 -3.64 4.90 9.65 5.47 2.90 1.19 0.00 -0.87 -1.52 -2.03 -2.43 -2.75 -3.01 -3.22 -3.40 -3.55 -3.68