这里有三列：
indx vehID LocalY
1 2 35.381
2 2 39.381
3 2 43.381
4 2 47.38
5 2 51.381
6 2 55.381
7 2 59.381
8 2 63.379
9 2 67.383
10 2 71.398
11 2 75.401
12 2 79.349
13 2 83.233
14 2 87.043
15 2 90.829
16 2 94.683
17 2 98.611
18 2 102.56
19 2 106.385
20 2 110.079
21 2 113.628
22 2 117.118
23 2 120.6
24 2 124.096
25 2 127.597
26 …