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Figure 6.3.
Comparison of global-mean annually averaged surface temperature time series, illustrating
the similarity of results from three different analyses. The series, displayed as anomalies from
their 1961–1990 means, are from (a)1890–1998 and (b) 1979–98, and include least squares
linear regression lines for each. The purple line represents the Quayle et at. (1999) data set; the
black line represents the Jones et al. (1999) data set; and the aqua line represents the Hansen et
al. (1999) data set.
