:ref:`section_ref_algorithm_ExtendedBlue` or a
:ref:`section_ref_algorithm_3DVAR`.
+.. ------------------------------------ ..
+.. include:: snippets/Header2Algo12.rst
+
+.. include:: snippets/FeaturePropLocalOptimization.rst
+
+.. include:: snippets/FeaturePropDerivativeNeeded.rst
+
+.. include:: snippets/FeaturePropParallelDerivativesOnly.rst
+
.. ------------------------------------ ..
.. include:: snippets/Header2Algo02.rst