max [ S , max $partialdiff sub X$ ( IRI NOAA-VECTOR R0FCST R0FCST_DJF20182019 ) ] selection

You can interactively pick out the data you would like with the Data Viewer.

Otherwise choose the variable you would like to select data from:

• Hecho en, $partialdiff sub X$ Probabilidades - R0 - Categorías