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+-----------------+-----------------+
| **minimum** | 0.0 |
+-----------------+-----------------+
| **maximum** | ∞ |
+-----------------+-----------------+
| **perfect** | N/A |
+-----------------+-----------------+
| **orientation** | positive |
+-----------------+-----------------+
Reference:
* Bretherton, Christopher S., et al. "The effective number of spatial degrees of
freedom of a time-varying field." Journal of climate 12.7 (1999): 1990-2009.
"""
skipna = metric_kwargs.get('skipna', False)
return effective_sample_size(forecast, verif, dim=dim, skipna=skipna)