def __init__(self, title='Unnamed'):
self._title = str(title)
self._n_atoms = 0
self._coords = None
self._hv = None
self._sn2i = None
self._timestamps = None
self._kdtrees = None
self._bmap = None
self._bonds = None
self._cslabels = []
self._acsi = None
self._n_csets = 0
self._data = dict([(field.var, None)
for field in ATOMIC_FIELDS.itervalues()])
