In the 2D View window, you can double click on a color patch to open an additional Spectral window. This window displays the relative spectral remission curve (Y axis) of the measured color for each wavelength (X axis). Use this to check, for example, the paper white measurement for the strength of the optical brightener. Optical brighteners in papers have a very characteristic curve shape.
Use the checkbox Scale to maximum relative spectral power for optimal adjustment of the spectral curve in the display window.
Note: The Spectral window is only available for spectrally measured colors. If you press the mouse button and move over the patches in the 2D view the spectral curve will be live updated.