“…The antenna has a radius of a = 15 cm, leading to a truncation order of N = 65 hence 4420 even spherical coefficients to retrieve. The measurement data is along an igloo sampling and has size 3458, leading to a sampling ratio of 78 %, slightly above the 75 % required by our previous study for fast measurements in [24]. The usual method in [1] would have required a data set of size around 1.7 × 10 4 .…”