Correspondence analysis of relative synonymous codon usage for Sulfolobus tokodaii genes:

	% variability Axis 1 9.7 Axis 2 5.9 Axis 3 4.9 Axis 4 4.7 Axis 5 4.1 Axis 6 3.7
Red (), blue () and green squares () correspond to genes proposed as being acquired by HGT and included in regions with a low, high and non-deviated G+C content, respectively. Yellow cross diagonals (x) correspond to putative highly expressed genes.
Correlation values between main axis in correspondence analysis and different parameters. See the Abbreviations used:   %G+C1 %G+C2 %G+C3 %G+CT Nc P2 X2 ICDI Axis 1 -0.1 -0.1 -0.8 -0.6 -0.4 -0.4 0.3 0.3 Axis 2 -0.0 0.0 -0.2 -0.1 0.0 -0.1 0.1 0.1