Synthetic observations and corresponding tomographic reconstructions of a CME event, shown 12.5 hr after launch. (a) Synthetic white-light images from two ecliptic viewpoints located at 175° and 235° longitude. (b), (c) Slices of the reconstructed electron density and plasma velocity obtained using our tomographic reconstruction method, illustrating the 3D CME structure. Note that panel (b) shows ecliptic slices at 0° latitude and panel (c) shows slices at 135° longitude. White arrows indicate velocity vectors > 300 km s⁻¹. The white dashed lines mark the main propagation direction of the CME at 0° latitude and 135° longitude in heliocentric coordinates.