Evolution of semi-major axis and eccentricity for the five planets of 55 Cnc assuming the “nominal” tidal dissipation for 55 Cnc e and the initial conditions come from Dawson & Fabrycky (2010). Top panel: the semi-major axis is plotted in thick colored lines, the colored dashed lines represent the distance of aphelion and perihelion for each planet. The corotation radius is indicated by a black dashed line and the thick red dashed line is the stellar radius. Bottom panel: the colored full lines represent the eccentricities of the five planets, the dashed dotted lines represent the secular evolution 55 Cnc e (purple) and 55 Cnc b (blue) would experience if alone in the system. The thick red dashed line represent the critical eccentricity of planet e above which its secondary transit depth is increased by more than 10% by tidal heating.