Coronagraph observations. Top: COR1A intensity as a function of position angle and distance from the center of the disk, r. Middle: same as top, with the pre-CME intensity subtracted. Bottom: cut of intensity as a function of time and r at a position angle of 61°. Horizontal lines are at the same r in all panels. Vertical lines in the top and middle panel mark the position angle of the cut. Bottom panel: vertical line marks the time of the other panels. The photospheric limb is at r = 972″.