1 .. index:: single: CheckingPoint
4 *Vector*. The variable indicates the vector used as the state around which to
5 perform the required check, noted :math:`\mathbf{x}` and similar to the
6 background :math:`\mathbf{x}^b`. It is defined as a "*Vector*" or
7 "*VectorSerie*" type object. Its availability in output is conditioned by the
8 boolean "*Stored*" associated with input.