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Update why-xarray.rst with clearer expression #3307

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5 changes: 2 additions & 3 deletions doc/why-xarray.rst
Original file line number Diff line number Diff line change
Expand Up @@ -62,9 +62,8 @@ The power of the dataset over a plain dictionary is that, in addition to
pulling out arrays by name, it is possible to select or combine data along a
dimension across all arrays simultaneously. Like a
:py:class:`~pandas.DataFrame`, datasets facilitate array operations with
heterogeneous data -- the difference is that the arrays in a dataset can not
only have different data types, but can also have different numbers of
dimensions.
heterogeneous data -- the difference is that the arrays in a dataset can have
not only different data types, but also different numbers of dimensions.

This data model is borrowed from the netCDF_ file format, which also provides
xarray with a natural and portable serialization format. NetCDF is very popular
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