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Confusability matrices when matching the singing and speaking clips (top two panels) and when matching the two speaking clips (bottom two panels). Celebrity matrices are shown on the left. Erroneous matches to the foil speaking clips are shown in blue in the bottom three rows of each matrix. Lighter cells indicate a higher incidence of pairing and thus are expected along the diagonal from top left to bottom right. Yellow cells indicate an erroneous cross-sex match.
