Development 143: doi:10.1242/dev.129775: Supplementary information
Development • Supplementary information
Fig. S1. Switch-Point Analysis for Growth Rate Plot. Deviation, quantified as residual sum of
squares (RSS), between the biphasic exponential model fit and the data shown in Fig. 1G for the
different switch points. The switch point that results in the lowest RSS is marked (red).
Development 143: doi:10.1242/dev.129775: Supplementary information
Fig. S2. Residuals of model fits to data and analysis of the normality of the residuals. Residuals
are expressed as difference between the logged data and simulation results. Fitting residuals are
mostly normally distributed with the exception of the initial difference between simulation and data
for the posterior area. This is due to the initial difference between the observed and simulated ellipse
𝑏
Development • Supplementary information
axis ratio σ = 𝑎 (Fig. 4E).
Development 143: doi:10.1242/dev.129775: Supplementary information
Development • Supplementary information
Fig. S3. Impact of an additional area increase of the posterior area. An additional increase in the
posterior area, as may arise from posterior proliferation or cell size increase, was incorporated by
setting Φ > 1 (from 1.1 to 1.3, dark grey to light grey). The overall growth dynamics are preserved in
all cases and the models predict a growth rate decline independent of the value of Φ for the different
models (A-E: EXP, F-J: E+C, K-O: POW, P-T: P_A)
Development 143: doi:10.1242/dev.129775: Supplementary information
Development • Supplementary information
Fig. S4. The average posterior length and the maximal posterior length are strongly correlated
in the measured data. Lp_mean = -7.6+0.9*Lp_max.