The unweighted sample standard deviation of the data array.
Returns a scalar cf.Data object.
f.sd() is equivalent to f.data.sd(ddof=1, squeeze=True).
See also
cf.Data.sd, max, mean, mid_range, min, range, sample_size, sum, var
>>> f.sd() <CF Data: 34.458 hPa>
cf.Field.sample_size
cf.Field.select
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