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This is the official guidance document to start with when considering what repository to use. It outlines the priorities of what to consider when chosing a repository, as well as broad issues of repository characteristics.
This link provides directions for sharing supplementary files with a Pubmed Central deposit. A moderate amount of data in common formats (image collections, spreadsheets, text) may be added to articles in Pubmed Central as a supplementary material. The PMC file with the data as supplementary material is an appropriate repository for the new data sharing policy.