code: def _get_to2(self):
      # NOTE: bh2o is actually ao2 for ABI
      return np.exp(-self._G_O2 * self._bh2o)
  
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 2 for calling the _ABIAtmosphereVariables obj's underlying member method code with example usage: obj._get_to2() and returns: np