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standard_name = (CF-compliant standard name. Use only if units and sign match CF. See https://cfconventions.org/Data/cf-standard-names/current/build/cf-standard-name-table.html )
cell_method methods = “time: mean” for time-averaged history.
cell_method methods = “time: point” for instantaneous values. Other possibilities are in http://cfconventions.org/Data/cf-conventions/cf-conventions-1.8/cf-conventions.html#appendix-cell-methods
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