Figure S8. Relative variance of two candidate, scale-invariant variables derived from our raw myosin measurements. wobs corresponds to rescaled myosin fluorescence intensity without background subtraction, while wbs corresponds to rescaled myosin with background subtraction. We note that the relative variance of wbs myosin at the intra-embryo A and intra-stage B levels is lower than wobs, motivating the use of the former as our myosin variable. DC dorsal closure. (PDF 617 kb)