(Left) Photospheric flux (grey line), contribution from accretion (fF, dashed line) and total flux (solid black line) for M_∗ = 2.5 M_⊙, R_∗ = 2.6   R_⊙, T_∗ = 9000 K, ℱ = 10¹² erg cm^-2 s^-1 (T_col = 12   470 K) and R_i = 2.5   R_∗. The mass accretion rate is 5 × 10^-7 M_⊙ yr^-1, (f = 0.084). All fluxes are computed at the stellar surface. The transmission curves of the U and B filters are plotted in violet and blue, respectively. The convolution of the fluxes with the filter responses provide the synthetic photometric points used to obtain the modelled photospheric and total colours (from the shaded and filled linked circles, respectively). (Right) Predicted excess in the Balmer discontinuity as a function of mass accretion rate for T_∗ = 6500, 9000, and 12 500 K (red, green, and blue lines) and log g = 4.0 and 3.0 (solid and dashed lines). ℱ = 10¹² erg cm^-2 s^-1 and R_i = 2.5   R_∗ for all cases.