Comparison of solar wind speed data mapped to the L1 point by temporal shifting. The first and second panel show comparison of the observed data and simulated results. Data of STB, L1 and STA are represented by green, blue and red scatters. The third, fourth and fifth panels show the difference between L1/STB, STA/L1 and STA/STB shifted speed. In these three panels, a horizontal dashed line at the position of v = 0 is added. Difference between observation and simulation are represented by purple and black scatters.