code: def data_ma(self):
          
  
          mask = (self._segment_img[self.slices] != self.label)
          return np.ma.masked_array(self._segment_img[self.slices], mask=mask)
docs: A 2D `~numpy.ma.MaskedArray` cutout image of the segment using
          the minimal bounding box.
  
          The mask is `True` for pixels outside of the source segment
          (i.e. neighboring segments within the rectangular cutout image
          are masked).