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Figure 1 Sample F-wave morphologies: F– = negative F-wave; F+(n) = notched positive F-wave; F–/f+ = biphasic predominantly negative F-wave with a small terminal positive component; f–/F+ = biphasic predominantly positive F-wave with a small initial negative component; F+/f– = biphasic predominantly positive F-wave with a small terminal negative component; I = biphasic, isoelectric F-wave with approximately equal positivity and negativity.