Fig. 6.

The universal transition from semipushed to fully pushed waves. For three different models on an Allee effect, the scaling exponents for the heterozygosity and front diffusion collapse on the same curve when plotted as a function of $v/v_{\mathrm{F}}$. Thus, $v/v_{\mathrm{F}}$ serves as a universal metric that quantifies the effects of cooperativity and separates semipushed from fully pushed waves. We used squares and plus signs for the model specified by Eq. 3, triangles and crosses for the model specified by Eq. 9, inverted triangles and stars for the model specified by Eq. 10, and the red line for the theoretical prediction from Eq. 5.