Evolution of the present-day triple-star system in V1371 Tau. The initial eccentricity of the inner B+B binary is e_A = 0.02. Left panel: time evolution with an initial mutual inclination of i_A = 20^∘. From top to bottom, the inclination of the inner binary relative to the outer binary, the eccentricity of the inner binary, the longitude of ascending node of the inner binary, and the longitude of periastron of the inner binary. Right panel: the maximum and minimum eccentricity of the inner binary (upper) and the minimum periastron separation (lower) for a range of initial mutual inclinations. The hatched region in the lower panel shows the approximate range where the periastron separation becomes small enough for the system to be a merger candidate, r_p,A < 3(R_Aa + R_Ab) = 0.16 au.