Erratum: Observation of the fractional quantum Hall effect in graphene

Nature 462, 196–199 (2009) In this Letter, an arithmetic error led to the incorrect value to be reported for the activation energy E A of the gap of the ν = 0 state. The incorrect values for E A are shown in Fig. 4c and referred to once in the text of the manuscript. A corrected Fig. 4c is shown here.