Syntax
=====

.. code-block:: text

    interspectrum = LIRE_INTE_SPEC (
        ◆ UNITE = unit,
        ◇ FORMAT_C =/"REEL_IMAG ",
                     /"MODULE_PHASE" (by default),
        ◇ FORMAT =/"ASTER" (by default),
                   /"IDEAS ",
        ◇ NOM_PARA =/"DX",
                     /"DY",
                     /"DZ",
                     /"DRX ",
                     /"DRY ",
                     /"DRZ ",
                     /"TEMP ",
                     /"INST ",
                     /"X",
                     /"Y",
                     /"Z",
                     /"EPSI ",
                     /"FREQ" (by default),
                     /"PULS ",
                     /"AMOR ",
                     /"ABSC ",
        ◇ NOM_RESU = text (default: "DSP "),
        ◇ INTERPOL =/"LIN ",
                     /"LOG ",
        ◇ PROL_DROITE =/"CONSTANT ",
                        /"LINEAIRE ",
                        /"EXCLU ",
        ◇ PROL_GAUCHE =/"CONSTANT ",
                        /"LINEAIRE ",
                        /"EXCLU ",
        ◇ TITRE = text,
        ◇ INFO =/1 (by default),
                 /2,
    )
    
    ◆: mandatory
    ◇: optional
    : present by default
    &: together
    /: only one among
    |: several possible choices