Band Shifting

Changes in band position were analysed in a similar way. Simulated bands were constructed with one or two components changing simultaneously, and the synchronous and asynchronous maps are represented in Fig. 4.3. In all the synchronous

Fig. 4.3. 2D correlation maps corresponding to changes in position (band shifting) of a band composed of one peak(boffom) or two peaks (top). Synchronous maps are located to the left and asynchromous ones to the right. The axes are as in Fig. 4.2

maps, autopeaks are located at the initial and final positions of the maxima during band shifting. Ms is the reason why two peaks are observed in the synchronous map corresponding to a change of band position in one peak. Cross-peaks are positioned next to the equivalent autopeaks with a negative intensity since the intensity at a given frequency at the beginning of the shift decreases, whereas the intensity at a different frequency will increase after the shift, tte characteristic shape in the asynchronous maps for a band shift is a butterfly (Gericke et al. 1996) or a banana, depending on whether we consider the full symmetric map or only one side of the diagonal. tte peaks include the frequencies through which the maximum has moved throughout the band shifting. As in the synchronous spectra, there are also cross-peaks of the opposite sign between the beginning and the end of the "bananas".

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