The hologram was measured in 18039 spatial points.
A frequency sweep of 1601 points from 50 to 70 GHz has been made at each spatial point.

Data are given in a .mat file in a struct with 4 fields:
grid: 18039 x 3 matrix. Coordinates (x, y, z) correspond to columns 1, 2 and 3 respectively. Units are [meters].
frequencies: 1601 x 1 vector with the swept frequencies. Units are [Hz]
Hologram: 18039 x 1601 matrix. Each row corresponds to the hologram in the frequency domain. Units are [V/m].
reference: 1601 x 1 vector. static reference branch for the swept frequencies. Units are [V/m].