Accessing data using CPT (ingrid imposes a limit of 3999 points in the degrees-east grid)

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$partialdiff sub feature_id$ $integral dfeature_id$ [ Features Political Africa Provinces prov_na ]

feature_id grid: /feature_id (unitless) ordered [ (1.0) (2.0) (3.0) ... (251010.0)] N= 670 pts :grid

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CPTv10+