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Contributors SF performed the statistical reanalysis of Bermon and Garnier’s data. JOB provided original data from his doctoral dissertation. SC conceived the idea for the paper, coordinated the team work, was responsible for ensuring the coherence among the different parts and for the final draft of the manuscript. All authors provided feedback at all stages and approved the final version of the manuscript.
Competing interests None declared.
Provenance and peer review Not commissioned; externally peer reviewed.
Data sharing statement The doctoral dissertation by JOB (in Spanish) is available for download here (http://oa.upm.es/47157/) with username and password to be requested to the author.