Green in Sherpa: Author's Pre-print: author can archive pre-print (ie pre-refereeing)
Author's Post-print: author can archive post-print (ie final draft post-refereeing)
Publisher's Version/PDF: author cannot archive publisher's version/PDF, requested (Zhang) accepted version & permission, 11.4.14-MMM. Received both 14.4.14-MMM. Supporting documentation added to dark upload - HD 20/7/18