'Turning secondary keys into primary keys in dataframe
Pandas Dataframe: Turning secondary keys into primary keys in Python
I would like to pass the secondary keys of this plot as primary key. Currently, the primary key is 'ustar' but I want 'time', 'latitude' and 'longitude' to be the primary keys. How do I do this?
ustar = ds['ustar'].to_dataframe()
print(ustar)

Thanks for your help!
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