Regarding the first issue highlighted by Power and Murray (2020), Bretan et al. (2020) presented a meta-analysis of 38 datasets to attempt to synthesise observations made independently by many different authors. As such, it is inappropriate to include all of the data for every example. References to the original publications are given where available, and we discussed the relative reliability of the various studies.

As Power and Murray (2020) mention, confidentiality restrictions place limits on what can be published. Murray et al. (2020) acknowledged the same issue in their contribution to SP496: ‘In addition to the six case...

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