code: def fetch():
      
      doi = '10.7910/DVN/AFJNWJ'
      fname = os.path.join(
          data_dir(),
          'lenz2017',
          'ebv_lhd.hpx.fits')
      fetch_utils.dataverse_download_doi(
          doi, fname,
          file_requirements={'filename': 'ebv_lhd.hpx.fits'})
docs: Downloads the Lenz, Hensley & Doré (2017) dust map, placing it in the
      default :obj:`dustmaps` data directory.