Hi Cesc,
Thank you again for your suggestions.
I tried to input the divergence in the source.f file but this did not generate a change in the divergence of the primary beam. So maybe I cannot reach what I need modifying source.f.
What I need is a primary beam with a rectangular shape in X and Y and with 11 mrad divergence in X and 0 mrad in Y.
Cheers,
Gian Luigi