The plot shows the heights of each antenna in the array with respect to the average height. For the purposes of a phased array, the relative positions are important. Our concern had been that freezing/thawing of the ground would result in shifts in the surface. Additionally, there might be some subsidence on the side where the mound had been built up to match the main field height. In these cases, it is possible that the soil is not sufficiently well packed and that it sinks slightly as it settles further.
As can be seen from the data, the heights are all within the +/- 3 cm specification.
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