how to extract data from xsteam to simulink using lookup tables?

p = p_in;
a = 1000;
b = 0.01;


h_vap = zeros(1,((a-1)/b));
L = length(h_vap);

for i = 1:L

    T(i)= 1+b*i;
    h_vap(i) =XSteam('h_pT',p, T(i));
end

I am calling the data using teh basic code and I am using h_vap and T as break points and table data. The value i am getting is not correct, but when i use

XSteam('h_pT',10, 200)

the value is accurate. Please let me know is there any way to obtain data.