Figure 2.

The error due to assuming constant curvature is estimated. (a) The relative error, $\left|r-r_{\mathrm{1,2}}\right|/r_{\mathrm{1,2}}$, of each nucleus defining the yolk-cells interface $\left(r_1\right)$ and the cells-medium interface $\left(r_2\right)$ is calculated (inset). This relative error is evaluated in dependence of latitude, ϕ, by averaging over the values in bins of size $\Delta \varphi =\pi /16$. The plot shows data of all performed contact-angle measurements of $n=14$ embryos for the yolk-cells (red circles) and cells-medium (blue diamonds) interfaces. (b) To check a possible time dependence of the relative error, it is plotted here for an individual embryo with color-coding depending on time and latitude. This is done for yolk-cells (top) and cells-medium (bottom) interfaces. The same embryo is used as in Fig. 1. Black indicates areas for which no data were available. To see this figure in color, go online.