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Fractional shortening (FS): (EDD - ESD)/EDD, contraction efficacy on a 0-1 scale (SOHA FractionalShortening; computed by SOHA over the beats, so it differs slightly from (EndDiastolicDiam - EndSystolicDiam)/EndDiastolicDiam). Trait FS of the paper (Table 1, GWAS). 1-week-old female, semi-intact denervated heart, SOHA analysis of a ~20 s high-speed movie (140 frames/s); one value per fly. NA = removed by the authors' quality control (technical outlier) or not measurable. [Proportion / Ratio]