Normalised difference curves of the measured DM and simulated HM data of the 92 measurement points showing the in-phase and quadrature components of the QAM-modulated full-wave data (Case I, top row), the effect of the threshold parameter γ (Cases II–IV, middle rows), and the 80% maximum peak detection filtering (Case V, bottom row). The histograms of the filtered cases show how the distribution of the data changes between the two filtering techniques.