Plots of modeled (PFSS+WSA+HUX) and hourly averaged observed solar wind velocity from OMNI database at L1 with time for CR2183 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 profile 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 increases. The red arrows show the time period around which the prediction does not improve as R_ss increases. The shaded regions show the time period where R_ss significantly changes the modeled velocity profile.