Parameter e_out plotted against the fractional radius of the tertiary component r_B = R_B/a_out for 33 triply eclipsing triple systems that we have studied recently (see Sect. 8 for details). The red line sketches out the inverse correlation between these two parameters, with a functional form of e_out ≃ exp(−42r_B). Exceptions are the two systems marked with a faint green ellipse with very low eccentricities, but not large values of r_B. Numbers next to individual sources are the TIC numbers. We omit error bars on the systems with e_out ≳ 0.1 for increased clarity.