Updates are available Correction dated 2018-06-18

Article History

Received: 19 April 2017

Accepted: 6 July 2017

First Online: 7 August 2017

Change Date: 18 June 2018

Change Type: Correction

Change Details: In the version of this Article originally published, the symbols for 'greater than' and 'less than or equal to' were inverted in the equation that definesσΔz. The original (1) and corrected (2) versions of the equation are shown below. This error did not affect the calculation of the uncertainties. In addition, erroneous values that were a remnant of an earlier version of the authors' work and higher than the final values calculated were reported for the uncertainties on ASTER estimates inInternalRef removed.InternalRef removedbelow shows the corrected values in bold font. These errors have now been corrected in the online versions of the Article.

Competing interests

: The authors declare no competing financial interests.