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Sharpness of PsychTCs in humans. Filled symbols, QERB values of FM PsychTCs (from figure 7 of ref. 14); open symbols, QERB values of SM PsychTCs (from figure 7 of ref. 14); solid line with no symbols, trend for the QERB values of SM PsychTCs reported by several studies (16-19) (from figure 7 of ref. 15).
