function [T1_app] = T_1approx_W1(x,u,d,p,v,A)


T_0 = u(1);
T_d1 = d(5);
F_0 = d(1);
F_d1 = d(4);
F_1 = u(3);


T1_app = (T_0 * F_0 + T_d1*F_d1)/F_1;



end