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Usually you can publish a draft version of your paper, but not the version that is edited by the journal. They should be mostly the same, though.

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Often people post to the Arxiv as well, clearly not formatted the same way as the journal publication. But in many cases the exact same text.

I'm not sure if some journals like Nature prevent or discourage you from doing this.

Nature (and the vast majory of journals) is OK with posting on arxiv the pre-review manuscript, but not the post-review (ie, with the changes made after the comments by the reviewers) and not the version they edited (and added their page layout).

Some journals allow us to post the post-review paper (at any rate, the changes are usually mostly cosmetic).

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