Use Retrieve Interferograms to view the original data for a spectrum, including the interferograms used for the background and for the sample. If you discover a problem with the transformed data, you may be able to diagnose the problem by examining the interferogram. For example, a sine wave in the baseline of a spectrum usually indicates a "double pass" of the infrared beam through the sample. The corresponding interferogram will often show a "spike" on the side of the data.
Desktop view only
From the spectra view, select a spectrum.
Go to the Process menu and select Retrieve Interferograms. The two interferograms are added to the spectra view.