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Fig. 7. Principal component analysis of muscle activity duration, relative onset of
muscle activity and EMG burst intensity for fish swimming at 1.2 L
s–1 (red triangles) and 2.0 L s–1
(green circles). Each point represents one measurement of muscle activity over
one tail beat cycle. A description of the variable types loading heavily on
each factor is given below the axis label. Further explanation of factor
loadings is given in the text.