Performance of TRIShUL as a function of input polarization signal for different cloud distances probed by f_bg (in different colors). Top panel: difference between the estimated parallax (ϖ_est) and the parallax of the star closest to the input layer (ϖ_true). Bottom panel: difference in estimated Stokes parameters (q_est, u_est) from the corresponding true values (q_true, u_true). The results corresponding to different f_bg are shifted by 0.02% on the X-axis for visual clarity. Horizontal dashed lines are the references to a perfect match between estimated and true parameters.