X1       X2      X3     X4
3.1881  3.2304  3.9088  4.1866
4.6036  4.9217  3.6628  3.8038
5.3042  5.4884  6.127   6.3215
7.0202  7.0774  5.7631  5.3002
6.1459  5.9892  4.8035  4.5959
4.5431  4.5821  5.534   5.4083
5.2622  4.9426  5.8101  5.8214
3.7463  4.016   4.9147  5.0417
5.3144  5.2027  6.2629  6.0614