Blue in Sherpa: Author's Pre-print: author cannot archive pre-print (ie pre-refereeing) Author's Post-print: author cannot archive post-print (ie final draft post-refereeing) Publisher's Version/PDF:   author can archive publisher's version/PDF. LL 26.5.14. Requested (Segu) Permission, 31.7.14-MMM. Supporting documentation added to dark upload - HD 14/11/19