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MASK APPLY 

        [ADVANCED\]MASK APPLY SicVariable

    Apply the mask to the corresponding 3-D variable.

    The space dimensions must coincide (pixel per pixel), but the spectral  axes
    can  differ.  The  command will select the appropriate Mask channel for each
    plane of the SicVariable.  If the Mask is 2-D only, it will  be  applied  to
    all planes.