Summary of results
======================

The results obtained are excellent since the frequency differences with the reference solution are less than :math:`\text{0.03\%}`. In addition, *Code_Aster* well detects the 6 rigid body modes, which we did not ask to calculate.

To effectively calculate rigid modes, two possibilities exist. With the 'BANDE' option on the :math:`(\mathrm{0,}3000\mathrm{Hz})` frequency band, you can use either the 'SORENSEN' method or the LANCZOS ('TRI_DIAG') method by specifying the 'MODE_RIGIDE' option.