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$$$$ TFR      NOTICE  CHAT      11/09/12    21:18:18     7124           
                                             DATE     11/09/12

    Operateur TFR                            Voir aussi : TFRI
    --------------   
    EVOL1 = TFR  N1 EVOL2 MOT1 ('FMIN' FLOT1) ('FMAX' FLOT2)...
                                                   ... (COUL1) (COUL2) ;


    Description :
    ____________

    The TFR operator constructs fast Fourier transform for a
signal.

    Contents :
    __________


    N1     : for fast Fourier transform, a number of points 
             equalling 2**N1 (ENTIER type) is used
             (if the processed signal is longer, it will be
             truncated, if it is shorter, some 0. will be added)

    EVOL2  : object containing the signal to be studied (EVOLUTION
             type); the step of the abscissae must be constant, the
             values of the signal being the ordinates. The object
             must be composed of a single curve
            
    MOT1   : word referring to the syntax of the TFR (Transformation
             de Fourier Rapide i.e. Fast FOURIER Transform) 
             complex values

             'REIM' for real part and imaginary part/Frequency
             'MOPH' for modulus and phase/Frequency

   'FMIN'   : key word followed by :
    FLOT1   : minimum frequency displayed ; it will be greater than 0.
              (FLOTTANT type, default value = 0.)

   'FMAX'   : key word followed by :
    FLOT2   : maximum frequency displayed ; it will be smaller than
              1/(2*DT), DT being the time step of the input signal
              (FLOTTANT type, default value = maximum value computed)

    COUL1   : chosen color from the first curve (MOT type)
              (white by default)

    COUL2   : chosen color from the second curve (MOT type)
              (white by default)

    EVOL1   : object containing the TFR, in the form of two curves.
              (EVOLUTION type)