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The reconstructions used, in order from oldest to most recent publication are:

1. (dark blue 1000-1991): The Holocene.
2. (blue 1000-1980): Geophysical Research Letters.
3. (light blue 1000-1965): Ambio. Modified as published in Science.
4. (lightest blue 1402-1960): J. Geophys. Res..
5. (light green 831-1992): Science.
6. (yellow 200-1980): Geophysical Research Letters. doi:10.1029/2003GL017814.
7. (orange 200-1995): Reviews of Geophysics. doi:10.1029/2003RG000143
8. (red-orange 1500-1980): Geophys. Res Lett.. doi:10.1029/2004GL019781
9. (red 1-1979): Nature. doi:10.1038/nature03265
10. (dark red 1600-1990): Science. doi:10.1126/science.1107046

(black 1856-2004): Instrumental data was jointly compiled by the Climatic Research Unit and the UK Meteorological Office Hadley Centre. Global Annual Average data set TaveGL2v [1] was used.

Documentation for the most recent update of the CRU/Hadley instrumental data set appears in: Journal of Climate.

The original version of this figure was prepared by Robert A. Rohde from publicly available data and is incorporated into the Global Warming Art project.

Image from Global Warming Art

This image is an original work created for Global Warming Art. Please refer to the Year Temperature Comparison.png image description page for more information.

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1. Data from Moberg et al. was taken directly from the supplemental information accompanying the Nature article.
2. Data for Oerlemans was provided by William M. Connolley.
3. Esper et al. reported only fluctuations in "arbitrary" units, so the variance in this record was rescaled to match the variance during the period of overlap with the instrumental record.
4. When a paper included multiple reconstructions, the global annually average temperature data was used. If this was not reported, then Northern Hemisphere annually averaged data was used.
5. Four records appearing at [2] were not used in preparing this graph for the following reasons:
   1. Mann et al. 98 was not included because Mann et al. 99 extended and updated that record.
   2. Briffa et al. 98 was not included because Briffa et al. 2001 extended and updated that record.
   3. Pollack et al. 98 was not included because the reported data was not found to be in a form that allowed for easy replotting.
   4. Mann et al. 2000 was not used because it did not include an original reconstruction covering at least the Northern Hemisphere.