| Add a macro to extract the highest 25% of the concentration values with the associated date. |
| Copy that data to columns G and H. |
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| Sort the copied data in date order. |
Add a button to run the macro. |
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| Write a Visual Basic function to convert coordinates displayed as ddmmss.ss (DegreesMinutesSeconds.SecondFraction) |
| to decimal degrees dd.dddddd |
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Name the function COOR() |
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