Rest-mass density distributions (left columns) and shock structure (right columns) and at three different times (i.e. t = 6.07,47.90 and 99.46h) for model S.00 and a recoiling velocity V_k = 300 km s^-1. Note that the last panel refers to almost 25 orbital revolutions. The rest-mass density is plotted on logarithmic scale and in cgs units, while the shock structure is obtained by plotting the quantity S_d (see beginning of Sect. 5.1.1 for a definition); shock waves can form in regions where S_d > 0. Note that is very hard to locate a shock by simply looking at the density distribution.