Three-dimensional model of the Sun observed from SDO (left) and STEREO-A (right). The dimming borders are shown with blue contours and the sectors are drawn as light blue lines (the filled area indicates the sector of dominant dimming propagation). Red points mark the reconstructed filament heights, and purple points are their orthogonal projections on the surface. The inner part of the GCS reconstruction is plotted as blue mesh. The dark red line presents the straight line fit to the reconstructed filament positions. The green line shows the axis of the CME, which is represented by the GCS croissant.