Plot 3D with differents axis size

Dear all,

I'm trying to plot in one figure F_1 (in Fig1) and i would like to hold on F_2 in points ('*');

subplot(1,2,1)
mesh(x,tspan,F_1);
title('Plot N 1')
subplot(1,2,2)
mesh(x,tspan,F_2);
title('Plot N 2');

% i can not use plot3D(x,tspan,F_3), since x and tspan are not the same
% length

**

Can someone please tell me how to hold on F_2 (Plot N°2) with points;

Thanks in advance;