docs: def fetch(clobber=False):
      """
      Downloads the Marshall et al. (2006) dust map, which is based on 2MASS
      stellar photometry.
  
      Args:
          clobber (Optional[:obj:`bool`]): If ``True``, any existing file will be
              overwritten, even if it appears to match. If ``False`` (the
              default), :obj:`fetch()` will attempt to determine if the dataset
              already exists. This determination is not 100\% robust against data
              corruption.
      """
  
      table_dir = os.path.join(data_dir(), 'marshall')
  
      # Check if file already exists
      if not clobber:
          h5_fname = os.path.join(table_dir, 'marshall.h5')
          h5_size = 5033290 # Guess, in Bytes
          h5_dsets = {
              'l': (801, 81),
              'b': (801, 81),
              'chi2_all': (801, 81),
              'chi2_giants': (801, 81),
              'A': (801, 81, 33),
              'sigma_A': (801, 81, 33),
              'dist': (801, 81, 33),
              'sigma_dist': (801, 81, 33)
          }
          if fetch_utils.h5_file_exists(h5_fname, h5_size, dsets=h5_dsets):
              print('File appears to exist already. Call ``fetch(clobber=True)`` '
                    'to force overwriting of existing file.')
              return
  
      # Download the ASCII table
      url = 'ftp://cdsarc.u-strasbg.fr/pub/cats/J/A%2BA/453/635/table1.dat.gz'
      md5 = '637b95b025517a8b9757b6465b632285'
      table_fname = os.path.join(table_dir, 'table1.dat.gz')
      fetch_utils.download_and_verify(url, md5, fname=table_fname)
  
      # Download the README
      url = 'ftp://cdsarc.u-strasbg.fr/pub/cats/J/A%2BA/453/635/ReadMe'
      md5 = '3b7c1296b181b3d77106ab50193dc7ee'
      readme_fname = os.path.join(table_dir, 'ReadMe')
      fetch_utils.download_and_verify(url, md5, fname=readme_fname)
  
      # Convert from ASCII table to HDF5
      dat2hdf5(table_dir)
  
      # Cleanup
      print('Cleaning up ...')
      os.remove(table_fname)
      os.remove(readme_fname)