Figure 1.

Sources extracted in the experiment A2, MM, NO at LTE. The first five rows show the source signals obtained in the experiments with A2, MM and NO at LTE, for all the methods under study and K-means clustering initialisation. The last row shows, from left to right, the mean spectra of A2, MM and NO, at LTE. Horizontal axis, for all plots: frequency in ppm scale. Vertical axis, for all plots: UL2 normalised intensity. The range of the vertical scales is fixed for each experiment and they are the same as those of the mean spectra of the last row, for comparative purposes.