x1 x2 x3 x4 rep1 rep2
-1 -1 -1 -1 30.3 28.6 
1 -1 -1 -1 28.5 31.4 
-1 1 -1 -1 24.5 25.6 
1 1 -1 -1 25.9 27.2 
-1 -1 1 -1 24.8 23.4 
1 -1 1 -1 26.9 23.8 
-1 1 1 -1 24.8 27.8 
1 1 1 -1 22.2 24.9
-1 -1 -1 1 31.7 33.5 
1 -1 -1 1 24.6 26.2 
-1 1 -1 1 27.6 30.6
1 1 -1 1 26.3 27.8 
-1 -1 1 1 29.9 27.7 
1 -1 1 1 26.8 24.2 
-1 1 1 1 26.4 24.9
1 1 1 1 26.9 29.3