mass8_31
t	x	y
6.96	132.133	77.048
7.024	117.237	68.023
7.088	102.351	59.005
7.167	88.976	51.114
7.231	74.033	42.128
7.295	63.928	36.108
7.36	68.159	28.498
7.424	77.953	19.817
7.488	88.179	11.467
7.567	97.9	3.192
7.632	107.193	-4.236
7.695	116.99	-11.97
7.76	126.295	-19.034
7.824	135.53	-25.952