Summary of results
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The test case is an example of the implementation of static correction, whether carried out *a priori* by adding static modes at the base of dynamic modes, or *a posteriori*. On a system specially calculated to show its effects, it shows that static correction can significantly reduce the error due to the modal truncation effect on "high frequencies" (static correction a posteriori), or even cancel it completely (static correction *a priori*), provided that the Ritz base thus obtained is re-orthogonalized. On an industrial study, we can expect a less visible effect.