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Fig. 3. Mean normalized EMGs from six dogs trotting uphill and downhill on an
incline of 14° to the horizontal (i.e. fore-aft force manipulation). For
each muscle, the black line represents the average EMG when the dogs trotted
on the level (control) and the grey line represents the average EMG when the
dogs trotted on the incline. For each dog, the trotting speed was the same
during the control and incline trials. The error bars are the s.e.m. for each
sampling bin.