text: import astropy.io.fits as fits
  from specutils import SpectrumList
  from specutils.io.registers import data_loader
  
  from .dc_common import FITS_FILE_EXTS, SINGLE_SPLIT_LABEL
  from ..parsing_utils import read_fileobj_or_hdulist
  
  WIGGLEZ_CONFIG = {
      "hdus": None,
      "wcs": None,
      "units": None,
      "all_standard_units": True,
      "all_keywords": True,
      "valid_wcs": True,
  }
  
  
  def identify_wigglez(origin, *args, **kwargs):
      """
      Identify if the current file is a WiggleZ file
      """
      with read_fileobj_or_hdulist(*args, **kwargs) as hdulist:
          if '2018MNRAS.474.4151D' in hdulist[0].header.get("REFCODE"):
              return True
      return False
  
  
  @data_loader(
      label="WiggleZ", extensions=FITS_FILE_EXTS, dtype=SpectrumList,
      identifier=identify_wigglez, priority=10,
  )
  def wigglez_loader(fname):
      spectra = SpectrumList.read(
          fname, format=SINGLE_SPLIT_LABEL, **WIGGLEZ_CONFIG
      )
      return spectra
  