Toy model of central systems in SDSS J1011+5442. Area in green shows the BLRs with G, F and E marking the inner boundary, the central point (red cross) and the outer boundary. Solid circle in blue (O) show the central BH. Purple cross (A) shows the inner boundary of central dust torus. Lengths of $\overline{\mathit{BC}}$ and $\overline{\mathit{BD}}$ mark the heights of the dust torus in the bright state and in the dim state. ∠BAC and ∠BAD represent the half opening angles of the dust torus in the bright state and in the dim state. Solid and dashed lines in red show the assumed direction of line of sight.