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Examples of median beats with the highest (top row) and lowest (bottom row) qualitative scores for the different electrode types (taken from different subjects and not simultaneously). Left column: best commercial gelled Ag/AgCl electrode (score of 10/10 for both). Central column: non-breathable tattoo electrode (highest score 10/10 and lowest score 8/10). Right column: breathable tattoo electrode (highest score 10/10 and lowest score 6/10).
