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The SNR (black square), signal correlation (yellow diamond), and coherence (blue dots) of semi-dry electrodes (Data derived from [23,27,45,59,63,64,65,66]), dry contact electrodes (Data derived from [39,44,46,53,55,70,72,73,75,76,81,83,85,86,88,89,91,92,94,96,98,116,117,118,119,120,121]), dry non-contact electrodes (Data derived from [11,47,48]) and microneedle array electrodes (Data derived from [57,58,102]), details are in Appendix A Table A2, Table A3, Table A4 and Table A5.
