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(a) D. (b) D*. (c) F. Different averages correspond to different SNRs: 2 averages (SNR = 26 dB), 3 averages (SNR = 37 dB), 4 averages (SNR = 46 dB), 5 averages (SNR = 59 dB), 6 averages (SNR = 65 dB).
