Genome organization stability Vs Gene content stability. Regression coefficients of the model G O S=α+β σ, where σ=1-φ and φ is the fluidity of genome content defined in  and Eq. 5. The yellow line corresponds to the coefficient obtained when all data points are used together (the tickness corresponds to its standard error). Species for which the regression is not good are in gray (see Additional file 4). Marker size is proportional to the intra-species phylogenetic distance.