Visualization initial electron beam

Dear users FLUKA,
I need to visualization initial electron beam(my source). How can I do it?
I read this Beam Trajectory Visualization - #2 by horvathd
but it is not clear and I do not understand it.
Best Regard,

Dear Mohammad,

thank you very much for your message! Do I understand it correctly that you use a separate routine to define your electron source and it is not defined via the BEAMPOS card? In that case the easiest way to visualize it at the start location would be to use the USRBIN card with a size covering the initial beam distribution and a good number of bins. Their number is set in the last column of the USRBIN, e.g. in the parameters NR, NPhi and NZ.
Does that help?

Best wishes,