Application of the DIRECD method to relate the expansion of coronal dimming to the early CME propagation. Left panel: CME cone model from the DIRECD method. Magenta boundaries outline the dimming. Point C is the filament source, and points A and B mark the largest extent of the north and south dimming. Red markers show the 3D coordinates of the filament, and the black line represents a linear fit to the filament points. The green cone, with a filament fit used as the cone’s central axis, has a height of 1.12 R_sun and a half-width (half-aperture angle) of 21°. Green dots indicate the orthogonal projections of the CME cone onto the solar surface. We require an edge of the cone base to be orthogonally projected to point B to match the extent of the dimming. Right panel: STEREO-A 195 Å base-difference image, together with the boundary of the identified dimming region (red) at the end of the impulsive phase (11:50:00 UT), and the orthogonal projections (green) of the best-fit cone obtained with DIRECD.