How to change streamslice figure z-axis offset?

I am trying to plot a 3d quiver vector field, a 2d contour, and a streamslice plot simultaneously in one figure. What I want to get is something like this:

but currently my streamslice plot is not on the same xy-plane as the the contour plot and the quiver plots:

I use the following commands to plot my graphs:

[~,h] = contourf(ygrid,zgrid,uq,10);

h.ContourZLevel = 6;

streamslice(ygrid,zgrid,vq,wq)

hold on

quiver3(y_array, z_array, x_array, v_array, w_array, u_array)

zlim([0 6.01])

% axis equal

hold off

where the contour plot z-axis offset could be changed easily through the ContourZLevel command.

I wonder if there is any fast way to change the z-axis offset of the streamslice plot?

Thank you!