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$partialdiff sub S$ [ NextGen CPT Estacional CPC Guatemala NCEP-CFSv2-PY Forecast target_date ]

S grid: /S (months since 1960-01-01) ordered (Jan 2019) to (Oct 2021) by 1.0 N= 34 pts :grid
Forecast Lead Time in Months grid: /L (months) ordered [ (2.5)] :grid

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CPTv10+