Distribution of the semi-major axis and eccentricity of the inner binaries with a metallicity of Z = 0.005 (top) and Z = 0.0005 (bottom) at the onset of TMT. The purple and red shaded regions correspond to systems that start the TMT phase with the formation of a CBD and BA, respectively. The red bars are plotted on top of the purple bars. We note that the range of the semi-major axis is different between the upper and lower panel.