def METHOD_NAME(self, local=False, trace_region=None):
    """
    Return the surface element connectivity.
    Parameters
    ----------
    local : bool
        If True, return local connectivity w.r.t. surface nodes,
        otherwise return global connectivity w.r.t. all mesh nodes.
    trace_trace : None or str
        If not None, return mirror connectivity according to `local`.
    """
    if trace_region is None:
        if local:
            return self.leconn
        else:
            return self.econn
    else:
        if local:
            return self.mleconn
        else:
            return self.meconn