For high-level flights, the charts cover the vertical area between FL50 to FL450 and are typically issued for the following specific FLs in Europe: 50,100,180, 240, 300, 340, 390 and 450. For low-level flights, the charts are issued typically for the following altitudes: 2000 ft, 5000 ft and 10000 ft. For the high-level charts, each FL corresponds to a specific pressure surface (pressure value):
FL50 = 850 hPa
FL100 = 700 hPa
FL140 = 600 hPa
FL180 = 500 hPa
FL240 = 400 hPa
FL300 = 300 hPa
FL340 = 250 hPa
FL390 = 200 hPa
FL450 = 150 hPa
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