code: def _get_th2o(self):
      raise NotImplementedError()
  
imports: from __future__ import annotations
  import logging
  from typing import Optional, Type, Union
  import dask.array
  import numpy
  import xarray
  from satpy.dataset.dataid import WavelengthRange
label_desc: Use image node_id 5 for calling the _AtmosphereVariables obj's underlying member method code with example usage: obj._get_th2o() without return types