0.0 0.0 0.0   1.0 0.0 1.5   3. 0.0 4.5    6. 0.0  10.0    7. 0.0  4.5     10. 0.0 .1

0.0 0.0 0.0   1.0 0.1 1.5   5.0 9.9 -3.5  6.0 10.0 -4.0      travel along to valley
 0.0 0.0 0.0  1.0  0.1  1.5   5.0 9.9 -3.5  6.0 10.-4.0
 0.0 0.0 0.0    1.0 0.1 1.5   5.0 9.9 -3.5  6.0 11.0 -4.5  7.0  12. -5.0      bad
 0.0 0.0  0.0    .5  .1  2.   1.0  .3  4.   2.  2.  5.    6.  11.  -4.0       crash