Deal with multiplications of spectrum contours

The contours of a spectrum in Analysis can be extended beyond the spectral boundaries, which can be useful when dealing with aliased peaks. For the user this will look as if the contours have been multiplied in the spectrum window:

These multiplications of “ghost” contours may be confusing at first, but have the advantage that a peak can be viewed and picked at its real frequency (instead of its aliased frequency at the original position).

The “ghost” contours dispalyed because the minimum and maximum aliased frequencies are set outside the original spectral boundaries. To get rid of the “ghost” contours, set the minimum and maximum aliased frequencies to be within the spectral boundaries. This is done in the {Referencing} tab in the Experiment: Spectra popup, using M: Experiment: Spectra: