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/462#issuecomment-129064642,https://api.github.com/repos/pydata/xarray/issues/462,129064642,MDEyOklzc3VlQ29tbWVudDEyOTA2NDY0Mg==,950575,2015-08-08T23:07:52Z,2015-08-12T01:52:18Z,CONTRIBUTOR,"Just for reference, in case some tries to implement this in xray,  iris has all but one (`ocean_double_sigma_coordinate`) of the ocean dimensionless vertical coordinates.

Code: https://github.com/SciTools/iris/blob/b94a5517bc6ff7c44492473ab3cefe77b7f6ec9b/lib/iris/aux_factory.py#L772-L1786

CF-conventions: http://cfconventions.org/Data/cf-conventions/cf-conventions-1.7/build/cf-conventions.html#dimensionless-v-coord
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