Support size in gstat object

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Support size in gstat object

piero campa
I couldn't find on ?gstat, ?predict.gstat nor here the answers to these little doubts:

:: Having to build a gstat object with a SpatialPixelsDataFrame and a SpatialPointsDataFrame, does the gstat object automatically recognize the supoprt size of the two variables? (That is a block of same dimensions of the cell size in the SPixelsDF, and a point for the SPointsDF instead)

:: Having then to predict a block co-kriged map on an output grid (again a SpatialPixelsDataFrame object) with its own cell size, do I have to explicitly specify the block or does the predict.gstat method automatically compute block co-kriging?

I think I know the answers but I would feel better with 100% certainty.
Thank you all,