html_url,issue_url,id,node_id,user,created_at,updated_at,author_association,body,reactions,performed_via_github_app,issue
https://github.com/pydata/xarray/pull/655#issuecomment-155882953,https://api.github.com/repos/pydata/xarray/issues/655,155882953,MDEyOklzc3VlQ29tbWVudDE1NTg4Mjk1Mw==,2443309,2015-11-11T19:16:20Z,2015-11-11T19:16:20Z,MEMBER,"I'll just chime in here quickly and layout how I think this should go - 
1.  If you set **anything**, it should not be overwritten.  This includes the `colormap` and `vmin`/`vmax`.
2.  If you want very specific/consistent behavior, you'll need to explicitly provide those arguments.
3.  The only safe times to assume a diverging colormap is when `vmin = -vmax` or when `center is not None`.  If you want a diverging colormap for other situations, you need to specify `cmap` in the plot call.

All in all, I think what I'm getting at is we may want to tighten up on when we switch from the default `cmap` to the diverging `cmap`.
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