final editorial revision

[alistairewj]

Please revise and resubmit your manuscript, taking into account the points below. Please also ensure that your manuscript complies with our format requirements explained in full in our Submission Guidelines:

http://www.nature.com/scientificdata/for-authors/submission-guidelines/

• [x] Please ensure all footnotes are integrated into the manuscript text and or reference list as appropriate. (see beneath 'Example Usage')
• [x] Please ensure all references to data throughout your manuscript are in the plural e.g. 'these data are'
• [x] Please ensure all bibliographic references are listed in order of first use

After that, the revision checklist:

• [x] A cover letter describing your response to our editorial requests.
• [x] The revised version of your text as a Word or TeX/LaTeX file.
• [x] The final versions of any Supplementary Information files.
• [x] Publication quality figures in the TIFF, EPS, or PDF formats.
• [x] Final accession numbers or DOIs for any deposited datasets.
• [x] Attach metadata template (available here). The completed tables should be uploaded with your revision as ‘Data Descriptor Worksheets’.