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The rate-gap resulting form \Gamma in Eq. (2) is precisely the instrument used to deal with the rate-loss when using "M-ary" transmission symbols instead of Gaussian signalling. Both [R1] (Han et al) and [R2] (Lv et al) state that MQAM/M-ary QAM is used to somewhat motivate the rate-gap rate formulation.
The reviewer recognizes that many publications are careless when replacing SNR with SINR values, especially when the interference is modulated (ie does not have the same distribution as the noise). Replacing SNR with SINR only seems immediately valid, when both Noise and Interference are complex Gaussian distributed.
Hence the previous comment of this reviewer to clarify the applicability of the given formula.
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