
X = [21 21 20.5 23.5 21.5 20 21.5 23 20 16.5 24.5 26 21.5 23 20 25.5 24.5 22 24 23 27.5 23 21.5 17 22.5 23 22;
    20 21.5 24 24.5 23 21 22.5 23 21 19 25 25 22.5 22.5 23.5 27.5 25.5 22 21.5 20.5 28 23 23.5 24.5 25.5 24.5 21.5;
    21.5 24 24.5 25 22.5 21 23 23.5 22 19 28 29 23 24 22.5 26.5 27 24.5 24.5 31 31 23.5 24 26 25.5 26 23.5;
    23 25.5 26 26.5 23.5 22.5 25 24 21.5 19.5 28 31 26.5 27.5 26 27 28.5 26.5 25.5 26 31.5 25 28 29.5 26 30 25];