id,node_id,number,title,user,state,locked,assignee,milestone,comments,created_at,updated_at,closed_at,author_association,active_lock_reason,draft,pull_request,body,reactions,performed_via_github_app,state_reason,repo,type
139863868,MDU6SXNzdWUxMzk4NjM4Njg=,788,Composite coordinate plot only works in one orientation,22805,closed,0,,,15,2016-03-10T11:44:40Z,2016-03-14T10:09:45Z,2016-03-13T20:06:02Z,NONE,,,,"When I create a composite coordinate i.e. `d.coords['c'] = d.a * d.b` and then try and plot a 2d plot of the data, it only works when the composite index is on the y axis.  When on the x-axis it fails with 

`TypeError: Dimensions of C (3, 5) are incompatible with X (4) and/or Y (6)`

ipynb notebook (and pdf version of same notebook) attached that recreate the error

[xarray composite coord plot.pdf](https://github.com/pydata/xarray/files/167044/xarray.composite.coord.plot.pdf)
[xarray composite coord plot.ipynb.zip](https://github.com/pydata/xarray/files/167045/xarray.composite.coord.plot.ipynb.zip)
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