Figure 1

(a) Vote-share standard deviation versus noise intensity $D$. The dashed black line marks the dispersion of the empirical data (${\sigma }_e=0.11$). Boxes surrounding the main plot (not shown here, they stay the same as in the Letter) display results obtained with the level of noise marked as squares and include the distribution of vote-shares shifted to have zero mean, and their spatial correlations. Black curves are initial conditions. In the red box, the red curve is for 10 MC steps, and the orange for 20 MC steps; in the green box, the times are 100 MC steps (red) and 200 MC steps (orange); in the purple box, 40 MC steps (red) and 140 MC steps (orange).