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. 2023 Jan 8;14(1):163. doi: 10.3390/mi14010163

Figure 9.

Figure 9

Maximum directivity and the normalized directivity for all of the modes are, respectively, 5.59 dB with 81°, 3.77 dB with 93°, 3.35 dB with 21°, 18°, 13° and 3.34 dB with 23°, 17°, 14°.