code: def _get_to2(self):
      return 1.0
  
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 3 for calling the _AtmosphereVariables obj's underlying member method code with example usage: obj._get_to2() and returns: int