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The two compared EEG caps shown turned inside out: (A) 64-channel dry PU-AgCl multipin electrode cap with equidistant layout, and (B) 64-channel gel-based sintered AgCl electrode cap with extended 10–20 layout. Corresponding detailed 2D electrode topographic layouts are shown in panels (C,D) for the dry- and the gel-based caps. Panels (A,B) are in front view (nose on bottom), and panels (C,D) show nose on top.
