Noncoding DNA, Zipf's law, and language.

In the report "Continent-ocean chemical heterogeneity in the mantle based on seismic tomography" by Alessandro M. Forte et al. (21 Apr., p. 386), note 14 (p. 388) should have included the following sentence at the end. "We note, however, that this classical measure of significance does not take into account the red spectrum of the observed nonhydrostatic geoid, whose harmonic coefficients cannot be properly regarded as a random distribution; therefore, the statistical significance of the measured correlation coefficient is possibly less than 99%.