Contour plot of lapse and shift vector for a boosted Schwarzshild black hole (Eddington-Finkelstein coordinates)

with the contours depicting levels of constant lapse and the line segments depicting the size

and direction of the shift vector.   The hole is traveling at 0.5c up this page.  The lapse is smaller ahead of the hole

than behind, thus the hole moves through the computational grid.  The ovoid is the apparent horizon, distorted in

these coordinates.