Fig. 6From: Comparative chloroplast genomes of Paris Sect. Marmorata: insights into repeat regions and evolutionary implicationsENc plotted against GC3s. The solid line represents the expected curve of positions of genes when the codon usage was only determined by the GC3s composition. ENc and GC3s plots for Sect. Marmorata: a PMa, b PMb, c PLa, d PLbBack to article page