Disk temperature, vapor condensation timescale (t_cond), and number density of water (n_H2O) during the outburst dimming phase of the best-fit model. Here t′=t − t_beg is the time lapse since the bolometric luminosity started to decline. The value of L_bol corresponding to this time is labeled. In the top row, the range of 140-150 K is shaded in white to highlight the snowline region. At t′ = 121 yr – the present epoch – the emission surfaces (τ_mm = 2/3) of ALMA band 5, 6 and 7 and disk photosphere (see Sect. C) are plotted along with the temperature contour. In the middle row, the region where no condensation occurs is plotted in white. In the bottom row, two lines denoting ice(vapor)-to-gas ratio of 10⁻³ are indicated to highlight the snowline region.