数据如下：
3.542485 ,1.977398 ,-1
3.018896 ,2.556416 , -1
7.551510 , -1.580030 , 1
2.114999 ,-0.004466 , -1
8.127113 ,1.274372 , 1
7.108772 ,-0.986906 , 1
8.610639 ,2.046708 , 1
2.326297 ,0.265213 , -1
3.634009 ,1.730537 , -1
0.341367 ,-0.894998 , -1
3.125951 ,0.293251 , -1
2.123252 ,-0.783563 , -1
0.887835 ,-2.797792 , -1
7.139979 ,-2.329896 , 1
1.696414 ,-1.212496 , -1
8.117032 ,0.623493 , 1
8.497162 ,-0.266649 , 1
4.658191 ,3.507396 ,-1
8.197181 ,1.545132 ,1
1.208047 ,0.213100 ,-1
1.928486 ,-0.321870 ,-1
2.175808 ,-0.014527 ,-1
7.886608 ,0.461755 ,1
3.223038 ,-0.552392 ,-1
3.628502 ,2.190585 ,-1
7.407860 ,-0.121961 ,1
7.286357 ,0.251077 ,1
2.301095 ,-0.533988 ,-1
-3.542485 ,1.977398 ,-1
3.0188
