X1 = (19.6,5.15,9.5\15.4,5.75,9.1\22.3,4.35,3.3\24.3,7.55,5.0\ 22.5,8.50,6.0\20.5,10.25,5.0\14.1,5.95,18.8\13.0,6.30,16.5\14.1,5.45,8.9\16.7,3.75,6.0\16.8,5.10,7.4)
X2 = (17.1,9.00,7.5\15.7,5.30,8.5\14.9,9.85,6.0\19.7,3.60,2.9\ 17.2,4.05,0.2\16.0,4.40,2.6\12.8,7.15,7.0\13.6,7.25,3.2\ 14.2,5.30,6.2\13.1,3.10,5.5\16.5,2.40,6.6)
X3 = (16.0,4.55,2.9\12.5,2.65,0.7\18.5,6.50,5.3\19.2,4.85,8.3\12.0,8.75,9.0\13.0,5.20,10.3\11.9,4.75,8.5\12.0,5.85,9.5\ 19.8,2.85,2.3\16.5,6.55,3.3\17.4,6.60,1.9)

#delimit ;
mat X1 = (
19.6,5.15,9.5\
15.4,5.75,9.1\
22.3,4.35,3.3\
24.3,7.55,5.0\ 
22.5,8.50,6.0\
20.5,10.25,5.0\
14.1,5.95,18.8\
13.0,6.30,16.5\
14.1,5.45,8.9\
16.7,3.75,6.0\
16.8,5.10,7.4);
mat X2 = (
17.1,9.00,7.5\
15.7,5.30,8.5\
14.9,9.85,6.0\
19.7,3.60,2.9\ 
17.2,4.05,0.2\
16.0,4.40,2.6\
12.8,7.15,7.0\
13.6,7.25,3.2\ 
14.2,5.30,6.2\
13.1,3.10,5.5\
16.5,2.40,6.6);
mat X3 = (
16.0,4.55,2.9\
12.5,2.65,0.7\
18.5,6.50,5.3\
19.2,4.85,8.3\
12.0,8.75,9.0\
13.0,5.20,10.3\
11.9,4.75,8.5\
12.0,5.85,9.5\ 
19.8,2.85,2.3\
16.5,6.55,3.3\
17.4,6.60,1.9);
#delimit cr

X1 = {
19.6 5.15 9.5,
15.4 5.75 9.1,
22.3 4.35 3.3,
24.3 7.55 5.0,
22.5 8.50 6.0,
20.5 10.25 5.0,
14.1 5.95 18.8,
13.0 6.30 16.5,
14.1 5.45 8.9,
16.7 3.75 6.0,
16.8 5.10 7.4};
X2 = {
17.1 9.00 7.5,
15.7 5.30 8.5,
14.9 9.85 6.0,
19.7 3.60 2.9,
17.2 4.05 0.2,
16.0 4.40 2.6,
12.8 7.15 7.0,
13.6 7.25 3.2,
14.2 5.30 6.2,
13.1 3.10 5.5,
16.5 2.40 6.6};
X3 = {
16.0 4.55 2.9,
12.5 2.65 0.7,
18.5 6.50 5.3,
19.2 4.85 8.3,
12.0 8.75 9.0,
13.0 5.20 10.3,
11.9 4.75 8.5,
12.0 5.85 9.5,
19.8 2.85 2.3,
16.5 6.55 3.3,
17.4 6.60 1.9};