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Figure 4 :Prognosis of noise effects for Frankfurt airport: on average one, two or three additional awakenings induced by aircraft noise per night (black lines, corresponding to 365, 730, or 1095 awakenings per year), LAeq = 55 dB (dark grey), LAeq = 50 dB (light grey). Calculations are based on 25,000 nocturnal aircraft movements in the busiest six months of the year

Figure 4 :Prognosis of noise effects for Frankfurt airport: on average one, two or three additional awakenings induced by aircraft noise per night (black lines, corresponding to 365, 730, or 1095 awakenings per year), LAeq = 55 dB (dark grey), LAeq = 50 dB (light grey). Calculations are based on 25,000 nocturnal aircraft movements in the busiest six months of the year