2. Syntax

interspectrum = CALC_SPEC (
    ◆/TAB_ECHANT = _F (
           ◆ NOM_TAB = table,
           ◇ LONGUEUR_DUREE = float,
           ◇ LONGUEUR_POURCENT = float,
           ◇ LONGUEUR_NB_PTS = int,
           ◇ RECOUVREMENT_DUREE = float,
           ◇ RECOUVREMENT_POURCENT = float,
           ◇ RECOUVREMENT_NB_PTS = int,
        ),
      /ECHANT = _F (
           ◆ NUME_ORDRE_I = int,
           ◆ NUME_MES = int,
           ◆ FONCTION = function,
        ),
    ◆/INTERSPE = _F (
           ◇ FENETRE =/"RECT" (by default),
                       /"HAMM ",
                       /"HANN ",
                       /"EXPO ",
                       /"PART ",
           # If: FENETRE == 'EXPO' or FENETRE == 'PART'
               ◇ DEFI_FENE = float,
        ),
      /TRANSFERT = _F (
           ◇ ESTIM =/"H1" (by default),
                     /"H2",
                     /"CO",
           ◆ REFER = int,
           ◇ FENETRE =/"RECT" (by default),
                       /"HAMM ",
                       /"HANN ",
                       /"EXPO ",
                       /"PART ",
           # If: FENETRE == 'EXPO' or FENETRE == 'PART'
               ◇ DEFI_FENE = float,
        ),
    ◇ TITRE = text,
    ◇ INFO =/1 (by default),
             /2,
)

◆: mandatory
◇: optional
: present by default
&: together
/: only one among
|: several possible choices