β CMi. The best-fit model is plotted as the black solid line, the photospheric contribution as the dashed black line, and a non-truncated disk model (R_out = R_c) as the black dotted line. Upper: SED in the 1000–10 000 Å interval. Middle: SED from 0.1 μm to 10 cm. The inset shows model predictions for different disk sizes. The observed fluxes are plotted with error bars, which are smaller than the symbol size in most cases. Lower: residuals structure of the best-fit model with R_out = 40 R_e. The photospheric and non-truncated models are also plotted in relation to the best-fit model, highlighting where these models deviate from the best-fit one.