Fig. 1.

Comparison of temperature reconstructions spanning the CE including the original Mann et al. (2) hockey stick reconstruction (1, 2) and its 95% uncertainty range and several different versions of the PAGES2k (Past Global Changes Last Two Millennium initiative) reconstruction (4) and uncertainty range, as well as the lower-resolution reconstruction of Marcott et al. (5) and its uncertainties. The smoothed Hadley Center and Climatic Research Unit Surface Temperature Product version 4 (HadCRUT4) instrumental global temperature series is shown for comparison. RegEM refers to a statistical reconstruction based on the Regularized Expectation-Maximization method.