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  1. FFTPHS(freqexpr)
  2.  
  3. Returns the Fast Fourier Transform phase value corresponding to
  4. 'freqexpr' (-NYQUIST <= freqexpr <= NYQUIST) determined by the most
  5. recent invocation of the FFT procedure.  FFTPHS is calculated as
  6. ARCTAN(FFTIM(freqexpr)/FFTRE(freqexpr)).  Using FFTPHS in an expression
  7. does not automatically set the Y axis scaling values.
  8.