ORIGINAL ARTICLE: 2020, v. 16, no. 6, p. 1408–1424, https://doi.org/10.1130/GES02278.1. First published 27 October 2020.

ERRATUM PUBLICATION: 2021, v. 17, no. 5, p., https://doi.org/10.1130/GES02278e.1. First published 30 August 2021.

In the denominator of Equation 7 on p. 1412, the subtraction should instead be an addition. The correct equation is
formula

The codes and calculations (e.g., to generate Fig. 4A) all use the correct equation.

The authors would like to acknowledge Philip England for pointing out the typographical error.

Gold Open Access: This paper is published under the terms of the CC-BY-NC license.