class_docstr: Get the reflective part of NIR bands.
class_docstr_tok: ["Get","the","reflective","part","of","NIR","bands","."]
code: def _get_tb13_4_from_optionals(optional_datasets):
      tb13_4 = None
      for dataset in optional_datasets:
          wavelengths = dataset.attrs.get("wavelength", [100.0, 0, 0])
          if (
              dataset.attrs.get("units") == "K"
              and wavelengths[0] <= 13.4 <= wavelengths[2]
          ):
              tb13_4 = dataset.data
      return tb13_4
  
file_path: satpy/satpy/modifiers/spectral.py
imports: import logging
  import xarray
  from satpy.modifiers import ModifierBase
label_desc: Use image node_id 5 for calling the NIRReflectance obj's underlying member method code with example usage: obj._get_tb13_4_from_optionals(optional_datasets) and returns: tb13_4