|Met Office Hadley Centre observations datasets|
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The red bars show the global annual average sea surface temperature anomalies from 1850 on. The error bars show the 95% uncertainty range on the annual averages. The green bar shows the provisional average for the year so far. The thick blue line shows the annual values (excluding the value for the current year) after smoothing with a 21 point binomial filter, the dashed portion of the smoothed line indicates where it is influenced by the treatment of the end points. The thin blue lines show the 95% uncertainty on the smoothed curve.
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