Measured power at the VST for (a) θ-polarization, (b) ϕ-polarization, and (c) combined polarization with number of measurement points aligned with 3GPP standards, i.e., N = 13 and M = 24.

Figure 31 of "Report on the development of efficient metrological methods forkey NR OTA RF parametric metrics (e.g. TRP, EIRP), for sub-6 GHz MIMO andmm-wave massive MIMO systems, and the quantification of the associateduncertainties (target the upper limits of measurement uncertainties for themeasured quantities given in 3GPP documents e.g. ETSI TR 38.810, TR 38.884)based on using, for example, direct far-field (DFF), indirect far-field (IFF), nearfield-to-far-field (NF-FF), mid field and reverberation chamber (RC) methods withvalidation in an interlaboratory comparison"