Configuration of our U Sco 1999 outburst model ﹩t\sim 9﹩ days after the maximum, i.e., when the WD photosphere shrinks to ﹩R_{\mathrm{ph}\,}=1.0\,R_{\odot }﹩. The cool component (right) is a slightly evolved MS (1.5 M_⊙) filling up its inner critical Roche lobe. Only the north and south polar areas of the secondary are heated up by the hot component (1.37 M_⊙ WD, left) because a large part of the light from the hot component is blocked by the flaring‐up edge of the accretion disk. Here the separation is ﹩a=6.87\,R_{\odot }﹩, and the effective radii of the inner critical Roche lobes are ﹩R^{*}_{1}=2.55\,R_{\odot }﹩ and ﹩R^{*}_{2}=R_{2}=2.66\,R_{\odot }﹩ for the primary WD and the secondary MS, respectively.