Abstract

This erratum corrects a typo in Equation (3) in the published article, which has a square root missing around the ratio of the sums of the power spectra on the right-hand side of the equation. The corrected Equation (3) in the published article must read euqation presented with all definitions remaining the same as in the published article. We have checked all codes that made use of the equation and confirm that all calculations were carried out correctly. The missing square root in the second equality in Equation (3) in the published article was merely a typo.