LM 24/07/18. Green in Sherpa. Author's Pre-print: green tick  author can archive pre-print (ie pre-refereeing) 
Author's Post-print: green tick  author can archive post-print (ie final draft post-refereeing) 
Publisher's Version/PDF: green tick  author can archive publisher's version/PDF 
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Published v. added with license, LL 15/4/2020