code: def get_area_def(self, key):
          
          if self._is_polar():  # then it doesn't have a fixed grid
              return super(CLAVRXFileHandler, self).get_area_def(key)
  
          l1b_att = str(self.file_content.get('/attr/L1B', None))
          return self._read_axi_fixed_grid(l1b_att)
docs: Get the area definition of the data at hand.