        lower    upper
X100 4.409630 5.308198
X1   5.722311 6.620878
100       X1 
4.858914 6.171595 


    X100       X1 
1.738397 3.114667 
        lower    upper
X100 1.254281 2.222514
X1   2.630551 3.598784
> 

      X100         X1 
-1.0036654  0.5608195 
           lower      upper
X100 -1.49660741 -0.5107233
X1    0.06787741  1.0537615

     X100        X1 
-6.646659 -6.788360 
         lower     upper
X100 -7.087602 -6.205715
X1   -7.229304 -6.347416


      X100         X1 
-11.268191  -8.621397 
          lower      upper
X100 -11.761846 -10.774536
X1    -9.115052  -8.127742
> 

     X100        X1 
-10.01812  -8.86707 
          lower     upper
X100 -10.465580 -9.570661
X1    -9.314529 -8.419610