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(a) Sagittal view through the center of acrylic sphere imaged at R=8 cm, z=7 cm (windowed). (b) Central slice of logarithm of FFT of acrylic sphere in (a) at kx=0 shows a measurable skew in the null cone as η1 is not equal to η2. (c) Central slice of logarithm of FFT at ky=0.
