confusion between comsol 3.5a and 4.3a

hello everyone,

It might be a noob question, but could anyone please tell me how this should work in comsol 4.3a.

So in comsol 3.5a in order to save the normalized electric field i just did this:

created the mesh:

x1=0:1.5e-9:150e-9;
y1=0:1.5e-9:150e-9;
z1=-150e-9:1.5e-9:150e-9;


Then had the export function (comsol_feldexport) as .m file which had the inerpolation done with postinterp.

After that, i saved the field at the grid points by using the following line:

results = comsol_feldexport(fem,filename,x1,y1,z1);

After that I had my fields and i was all happy.

I do not know how i could access fem anymore in comsol 4.3a, as after solving the Mfile, I only get 'ans' in the workspace and fem is not there anymore.

Please let me know if you have any information.

thanks in advance,