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/issues/1030#issuecomment-251355756,https://api.github.com/repos/pydata/xarray/issues/1030,251355756,MDEyOklzc3VlQ29tbWVudDI1MTM1NTc1Ng==,4160723,2016-10-04T10:48:17Z,2016-10-04T10:49:56Z,MEMBER,"Thanks for the tip @shoyer !

Using something like `combined.set_index(spectrum=['band', 'wn'])` or  `xr.concat(arrays, dim={'spectrum': ['band', 'wn']})` would be nice, although it may be a bit weird to use the key `spectrum` to rename the `wn` dimension here.

For now, I'm fine with setting the MultIndex using the more explicit - though more verbose - `combined.set_index(wn=['band', 'wn']).rename({'wn': 'spectrum'})`
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