code: def lotus_root_data():
      
      # TODO: Store data in some ODL controlled url
      url = 'http://www.fips.fi/dataset/CT_Lotus_v1/sinogram.mat'
      dct = get_data('lotus_root.mat', subset=DATA_SUBSET, url=url)
  
      # Change axes to match ODL definitions
      data = np.swapaxes(dct['sinogram'], 0, 1)[:, :]
      data = data.astype('float')
  
      return data
docs: Tomographic X-ray data of a lotus root.
  
      Notes
      -----
      See the article `Tomographic X-ray data of a lotus root filled with
      attenuating objects`_ for further information.
  
      See Also
      --------
      lotus_root_geometry
  
      References
      ----------
      .. _Tomographic X-ray data of a lotus root filled with attenuating objects:
         https://arxiv.org/abs/1609.07299