The sum of the data array.
Returns a scalar cf.Data object.
f.sum() is equivalent to f.data.sum(squeeze=True).
See also
cf.Data.sum, max, mean, mid_range, min, range, sample_size, sd, var
>>> f.sum() <CF Data: 17430607.321 hPa>
cf.Field.subspace
cf.Field.transpose
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