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Noise correlation matrix corresponding to the same subject displayed in Fig.6. Absolute value of the noise correlation coefficient in the (a) 20-Ch head coil (b) the 20-Ch Coil with uHDC helmet in V1 configuration. The cross-correlation of elements 1-4 was increased with the uHDC helmet present, otherwise no systematic differences were observed in the difference map (c). The average increase over the difference matrix was 0.0137. A schematic of the 20-Ch Coil is displayed in (d).
