code: def loopangle(c1: Dict[str, Any]) -> xarray.Dataset:
      
      angles = np.atleast_1d(c1['angle'])
      TR = xarray.Dataset(coords={'wavelength_nm': None, 'angle_deg': angles})
  
      for a in angles:
          c = c1.copy()
          c['angle'] = a
          TR = TR.merge(golowtran(c))
  
      return TR
docs: loop over "ANGLE"