The data files contain two fields, seperated by a blank line:
the tropospheric ozone column (below 200 hPa) and the estimated uncertainty in the tropospheric ozone column.
"No data" is denoted by 999.
Each field consists of 16 rows (latitudes) and 72 columns (longitudes).
The latitude runs from 20°S to 20°N, the longitude from 180°W to 180°E.
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| 2000 |
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| 2001 |
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| 2003 |
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| 1999 |
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| 2002 |
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| 1996 |
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| 1997 |
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| 1998 |
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