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Snapshot time from t = 190 μs (a), t = 200 μs (b), and t = 195 μs (c), for the radiation pattern of a point force (directed along x2) generating a Ricker pulse with central frequency 250 kHz and spectral bandwidth 10 kHz, located at 12.5 cm from the top and 25 cm from the left and the right edge of a field of 50 cm by 50 cm, applied to the “Lens 2”; morphing result (d) between (a) and (b), (e) is (c) transformed in a grayscale image, (f) is (d) transformed in a grayscale image and (g) is the absolute value of the difference between (e) and (f).
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