Fig. 6.

The phase lag was varied over one LF cycle [arrows in (a)] and the corresponding difference in HF scattered power $\mathrm{\Delta }{P}_i^{\text{RM},\text{SIM}}$ was estimated by $\overline{R_{i,1}^2}-\overline{R_{i,2}^2}$ as a function of the MB size using (3) (b). $R_{i,max}^2-R_{i,min}^2$ determined in Fig. 5 is also reported in (b) for comparison.