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