Green in Sherpa: author can archive pre-print (ie pre-refereeing), can archive post-print (ie final draft post-refereeing), author cannot archive publisher's version/PDF, 6.6.12-MMM. 
Permission form added to Dark Archive 20.4.2020—MMM
Metadata revised, LL 15/5/2020
Publisher permission added 26/10/2020 Lyn