Probability distribution P(R_t) for the disc radii expected in Sz 65 and Sz 66 assuming tidal truncation of the disc by its binary partner. The calculations were run for each binary partner for two different uniform eccentricity priors, one with e_max = 0.7, and one allowing for high-inclination solutions with e_max = 0.9. The vertical lines show the measured R₉₀ for each disc by this work.