0 0 PRESSURE ADJUSTED TO MEAN SEA LEVEL FOLLOWING WMO 8 FOR LOW LEVEL (< 50M) STATIONS
1 1 PRESSURE ADJUSTED TO MEAN SEA LEVEL FOLLOWING WMO 8 FOR STATIONS BELOW 750 M
2 2 PRESSURE ADJUSTED TO SEA LEVEL FOLLOWING NATIONAL PRACTICE
3 3 PRESSURE ADJUSTED TO LOCAL WATER LEVEL FOLLOWING NATIONAL PRACTICE
4 4 PRESSURE NOT CORRECTED FOR HEIGHT
15 15 MISSING VALUE
