code: def __call__(self):
      idx = self._find_coefficient_index(
          self._wv_range, resolution=self._resolution
      )
      band_luts = [lut_array[idx] for lut_array in self.LUTS]
      return band_luts
  
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 _Coefficients obj's underlying member method code with example usage: obj.__call__() and returns: band_luts