Syntax
=====

.. code-block:: text

    interspectrum = DYNA_SPEC_MODAL (
        ◆ BASE_ELAS_FLUI = melasflu,
        ◆ VITE_FLUI = float,
        ◇ PRECISION = float (default: 0.001),
        ◆ EXCIT = _F (
             ◆ INTE_SPEC_GENE = interspectrum,
          ),
        ◇ OPTION =/"TOUT" (by default),
                   /"DIAG ",
        ◇ TITRE = text,
    )
    
    ◆: mandatory
    ◇: optional
    : present by default
    &: together
    /: only one among
    |: several possible choices