Application of the DIRECD method to relate the expansion of coronal dimming to the early CME propagation. (a) Best fit DIRECD cone with the dimming outlined by magenta boundaries. Points A and B mark the largest north and south dimming extent. The best-fit green cone has a height of 0.81 Rsun, a width of 69.8°, and an inclination angle of 7.7°. The 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 points A and B to match the dimming extent. (b) Dimming detection: 193 Å SDO/AIA base-difference image together with the boundary of the identified dimming region (red) at the end of the impulsive phase at 05:43 UT. Points A and B mark the largest north and south dimming extent.