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                        1. By periods 
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                        2. Average for 1 day 
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                        3. Average for 1 month 
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                        4. Average for 1 year 
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                        5. Maximum and minimum pressure for 1 day 
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                        6. Maximum and minimum pressure for 1 month 
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                        7. Maximum and minimum pressure for 1 year 
 
                         
                        