Top: Hα line profile for the pure photospheric model (black solid line) and with a residual disk (VDD model) as defined in Table 5 and computed for the upper limit values of ρ₀ (cf. Fig. 4): 0.52 × 10^-12 g cm^-3 (thin disk; blue solid line) and 0.65 × 10^-12 g cm^-3 (thick disk; blue dashed line). Bottom: the difference between the disk models relative to the photospheric model. The observational limit set to the difference profiles defined in Sect. 3 is indicated by the shaded (gray) region.