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Relative IM3 (as a fraction of relaxed IM3 at full overlap) against relative tetanic tension obtained upon activation at different sarcomere lengths for activated (▪) and relaxed (◊) fiber bundles. Tension has been normalized to an initial control contraction at full overlap (Poverlap/Po). The dashed line is a fitted quadratic regression of tetanic IM3 upon Poverlap; the continuous line is a fitted linear regression of relaxed IM3 upon the Poverlap obtained upon activation.
