|Met Office Hadley Centre observations datasets|
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The red bars show the northern hemisphere annual average sea surface temperature anomalies from 1850 to 2007. The error bars show the 95% uncertainty range on the annual averages. The green bar shows the provisional average for the present year. The thick blue line shows the annual values after smoothing with a 21 point binomial filter. The thin blue lines show the 95% uncertainty on the smoothed curve.
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