In Fig. 2b of this Letter, the contour values were incorrectly normalized. The maximum and minimum values of 
1.4 in the scale bar in Fig. 2b should read 36.6. This error does not affect any of our results. We thank E. Rudberg for pointing out this error.
Corrigendum
Nature 446, 342 (15 March 2007) | doi:10.1038/nature05686
Half-metallic graphene nanoribbons
Young-Woo Son, Marvin L. Cohen & Steven G. Louie
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