Scattered fields for the DM and the HM analogs in the configuration described in Fig. 2 for ϕϕ polarization and the central transmitter–receiver position (Fig. 2). Measurement is in () and calculation in (- -). A Ricker window centered at 6.00 GHz is used. The vertical lines (1)–(6) shown in (a) and (b) correspond to the time points of interest, whose spatial correspondence is shown in Fig. 4 and Table 3.