Fig. 1: Measurements of microwave speckle and eigenchannel velocities.

a, b The intensity and (c, d) the phase patterns of the 1^st and 50^th TEs at a single frequency for a single polarization of the incident and output field in a single configuration. e The average number of phase singularities in polarized spectra. The intensity vanishes at a phase singularity. f The weight of waveguide modes in the 1^st and 50^th TE. g The EVs of the incident and transmitted waves vs. eigenchannel index, n. h The probability distribution functions (PDFs) of EVs for the incident and transmitted TE for \(n=1,30,50\). The differences between the input and output distributions in (g) and (h), are consistent with a small difference in orientation of the source and receiver antennas relative to the waveguide axis.