Plots of modeled (PFSS + WSA + HUX) and hourly averaged observed solar wind velocity from OMNI database at L1 (solid black line) with time for CR2143 for different R_ss, i.e., for R_ss = 2.0 R_⊙ (top panel), for R_ss = 2.5 R_⊙ (middle panel) and R_ss = 3.0 R_⊙ (bottom panel). The red, blue, and green dashed lines show the velocity profiles using HU ZPC, STD, and full ZPC maps, respectively. Green arrows show the time period around which R_ss optimization improves the match between the modeled and observed profile as R_ss decreases. The red arrows show the time period around which the prediction does not improve as R_ss decreases. The shaded regions show the time period where varying R_ss significantly changes the modeled velocity profile.