code: def _load_area_def(self, dsid, file_handlers):
          
          area_defs = [fh.get_area_def(dsid) for fh in file_handlers]
          area_defs = [area_def for area_def in area_defs
                       if area_def is not None]
  
          final_area = StackedAreaDefinition(*area_defs)
          return final_area.squeeze()
docs: Load the area definition of *dsid*.