MGAP CPT[hindcast_date Forecast InputObs target_date CrossValHind PearsonR CFSv2_AtlPac_sst PredErrorVars ]
grid: /X (degree_east) ordered (59.75W) to (52.25W) by 0.5 N= 16 pts :grid
grid: /Y (degree_north) ordered (29.25S) to (35.75S) by 0.5 N= 14 pts :grid
grid: /S (months since 1960-01-01) ordered [ (0000 1 Sep 2012) (0000 1 Oct 2012) (0000 1 Nov 2012) (0000 1 Sep 2013) (0000 1 Oct 2013) (0000 1 Nov 2013)] :grid
grid: /L (months) ordered (2.5 months) to (4.5 months) by 1.0 N= 3 pts :grid
$partialdiff sub Y$ [ MGAP CPT PredErrorVars ][ X Y | S L]

CPTv10+ files for $partialdiff sub Y$ [ MGAP CPT PredErrorVars ]