Slices of the x − y-plane at z = 0 showing the density (left column) and the temperature (right column) of Model r10_d2.6 for three points in time: 6.21 s, 7.71 s and 8.31 s (from top to bottom). The white contour marks the zero level of the radial velocity, i.e., it separates regions of expansion and contraction and the black contour indicates X(CO) = 0.8. The blue point in the bottom left panel shows the location of the detonation initiation.