if(packed.size())printf("points inserted DT %12.5E points per minut : %12.5E %d global searchs %d seachs per insertion\n",DT,60.*packed.size()/DT,N_GLOBAL_SEARCH,N_SEARCH/packed.size());
if(packed.size())
printf("points inserted DT %12.5E points per minute : %12.5E %d global searchs %d searchs per insertion\n",