Fig. 6.—

Quantification of N and C layers’ effect on CUB. Blue represents $\frac{dEN{C}_N^{\mathrm{☆}}}{dEN{C}^{\mathrm{☆}}}$ and red $\frac{dEN{C}_C^{\mathrm{☆}}}{dEN{C}^{\mathrm{☆}}}$. Species are ordered by increasing observed GC content. Interspecific results are shown on the right. Arrows indicate Escherichia coli and Salmonella enterica.