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Example position refinement for one Dual-Slope (DS) set. (a) Evolution of the positions of sources (1 and 2) and detectors (A and B) after random start positions, showing their trajectories as lines and final positions as symbols. (b) Free body diagram of all forces acting on sources and detectors. (c) Evolution of the four Single-Distance (SD) source–detector distances. (d) Evolution of the two Single-Slope (SS) source–detector distances’ difference.
