Figure 4: Summation of the same transition pair signals from Figure 3 results in just moderate quality improvement for the final signal. Low sample load; under the same conditions as in Figure 3, the sum of signal 4A and 4B is shown in panel 4C. There is no significant improvement for the combined signal, compared to individual signals. In contract, the multiplication product function clearly demonstrates a significantly increased S/N ratio (Figure 3C and Figure 4C).