old_contents: from .clusters import ClusterEnsemble  # noqa
  from .nfw import SurfaceMassDensity    # noqa
  import cofm                            # noqa
  import halobias                        # noqa
  
new_contents: from .clusters import ClusterEnsemble  # noqa
  from .nfw import SurfaceMassDensity    # noqa
  import cofm                            # noqa
  import halobias                        # noqa
  
  __version__ = '0.1.0'                  # noqa
  
subject: add version