traj_base_control.txt |    load control file |
600 |    start height |
tdump_fwrd |    forward file name |
traj_fwrd_control.txt |    save control file |
83 09 28 13 |    back start time |
38.665 -71.369 216.4 |    back start location |
tdump_back |    backward file name |
traj_back_control.txt |    save control file |