In general, the experimental observations were consistent with what was expected, except for the glitch in the FFT for the Na lamp.  The interferogram of the HeNe laser was a sine wave, which corresponded to a Fourier transform of a single spectral line.  Due to the doublet nature of sodium, the interferogram exhibited a beat pattern.  The Fourier transform of this interferogram should have been a doublet peak, but the Fourier transform yielded three.

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