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Extract a subset of the image variable VarName and put it in the EXTRACTED image variable.
Without argument, the region covered by the subset is defined by the SIZE, CENTER and RANGE values. In this case, the EXTRACTED variable dimensions are automatically derived from this values, and EXTRACTED can be bigger than the actual cube defined by VarName. Areas not covered by the initial VarName are filled out with the Blanking value of the VarName, or by zeros if VarName has no blanking.
If the arguments blc1 to trc3 are specified, the subset corresponds to VarName[blc1:trc1,blc2:trc2,blc3:trc3] of the image variable VarName. The BLCi and TRCi values must correspond to a valid subset.