Back-mapped points on the solar surface derived from the velocity profiles analysis for in situ point number 10 of Event 1. The background is a zoom-in of a synoptic AIA 193 Å map and their color represents the difference in their back-mapped time compared to the constant speed point (smallest travel time; red star). The point derived from the largest-r_s solar wind velocity profile (upper boundary on the travel time) is shown with a cross.