solved with this approach ..
data.getX().setItem(0, 23, 2.3000000000000007);
data.getY().setItem(0, 23, -0.59);
data.getX().setItem(0, 24, 2.4000000000000004);
data.getY().setItem(0, 24, -0.59);
data.getX().setItem(0, 25, 2.5);
data.getY().setItem(0, 25, -0.59);
data.getX().setItem(0, 26, 2.5999999999999996);
data.getY().setItem(0, 26, -0.49);
data.getX().setItem(0, 27, 2.6999999999999993);
data.getY().setItem(0, 27, -0.39);