CPTv10+ files for $partialdiff sub X$ mean max [ IRI NOAA-VECTOR R0FCST R0FCST_DJF20182019 ]

IRI NOAA-VECTOR R0FCST[PROBABILIDADES target_date R0FCST_DJF20182019 ]
grid: /X (degree_east) ordered (125.25W) to (66.25W) by 0.5 N= 119 pts :grid
grid: /Y (degree_north) ordered (50.25N) to (23.75N) by 0.5 N= 54 pts :grid
grid: /C (ids) unordered [ (Below) (Normal) (Above)] :grid
grid: /S (months since 1960-01-01) ordered (0000 1 Nov 2018) to (0000 1 Dec 2018) N= 2 pts :grid
$partialdiff sub X$ mean max [ IRI NOAA-VECTOR R0FCST R0FCST_DJF20182019 ] 2.5 months[ X | S L]