new_contents: """
  ==========================
  Calossal bundles using AFQ API
  ==========================
  An example using the AFQ API to find calossal bundles with the
  # TODO : find source of calossal bundles
  """
  import os.path as op
  
  import plotly
  
  from AFQ import api
  import AFQ.data as afd
  
  ##########################################################################
  # Get some example data
  # ---------------------
  #
  # Retrieves `Stanford HARDI dataset <https://purl.stanford.edu/ng782rw8378>`_.
  #
  
  afd.organize_stanford_data()
  
  ##########################################################################
  # Initialize an AFQ object:
  # -------------------------
  #
  # We specify bundle_info as the default bundles list (api.BUNDLES) plus the
  # callosal bundle list. This tells the AFQ object to use bundles from both
  # the standard and callosal templates.
  
  myafq = api.AFQ(bids_path=op.join(afd.afq_home,
                                    'stanford_hardi'),
                  dmriprep='vistasoft',
                  bundle_info=api.BUNDLES + api.CALLOSAL_BUNDLES)
  
  ##########################################################################
  # Visualizing bundles and tract profiles:
  # ---------------------------------------
  # This would run the script and visualize the bundles using the plotly
  # interactive visualization, which should automatically open in a
  # new browser window.
  bundle_html = myafq.viz_bundles(export=True, n_points=50)
  plotly.io.show(bundle_html[0])
  
subject: add callosal example